feat: 新增桌面应用支持

- 新增 desktop 应用入口，将后端与前端打包为单一可执行文件 - 集成系统托盘功能（getlantern/systray） - 支持单实例锁和端口冲突检测 - 启动时自动打开浏览器显示管理界面 - 新增 embedfs 模块嵌入静态资源 - 新增跨平台构建脚本（macOS/Windows/Linux） - 新增 macOS .app 打包脚本 - 统一 Makefile，移除 backend/Makefile - 更新 README 添加桌面应用使用说明
2026-04-22 19:27:27 +08:00
parent f5e45d032e
commit 0b05e08705
22 changed files with 1297 additions and 88 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -405,4 +405,9 @@ openspec/changes/archive
 temp
 .agents
 skills-lock.json
-.worktrees
+.worktrees
+!scripts/build/
+
+# Embedfs generated
+embedfs/assets/
+embedfs/frontend-dist/
--- a/115
+++ b/115
@@ -0,0 +1,115 @@
+.PHONY: all clean \
+	backend-build backend-run backend-test backend-test-unit backend-test-integration backend-test-coverage \
+	backend-lint backend-deps backend-generate \
+	backend-migrate-up backend-migrate-down backend-migrate-status backend-migrate-create \
+	frontend-build frontend-dev frontend-test frontend-test-watch frontend-test-coverage frontend-test-e2e frontend-lint \
+	desktop desktop-darwin desktop-windows desktop-linux package-macos
+
+# ============================================
+# 后端
+# ============================================
+
+all: backend-build
+
+backend-build:
+	cd backend && go build -o bin/server ./cmd/server
+
+backend-run:
+	cd backend && go run ./cmd/server
+
+backend-test:
+	cd backend && go test ./... -v
+
+backend-test-unit:
+	cd backend && go test ./internal/... ./pkg/... -v
+
+backend-test-integration:
+	cd backend && go test ./tests/... -v
+
+backend-test-coverage:
+	cd backend && go test ./... -coverprofile=coverage.out
+	cd backend && go tool cover -html=coverage.out -o coverage.html
+	@echo "Coverage report generated: backend/coverage.html"
+
+backend-lint:
+	cd backend && go tool golangci-lint run ./...
+
+backend-deps:
+	cd backend && go mod tidy
+
+backend-generate:
+	cd backend && go generate ./...
+
+backend-migrate-up:
+	cd backend && goose -dir migrations sqlite3 $(DB_PATH) up
+
+backend-migrate-down:
+	cd backend && goose -dir migrations sqlite3 $(DB_PATH) down
+
+backend-migrate-status:
+	cd backend && goose -dir migrations sqlite3 $(DB_PATH) status
+
+backend-migrate-create:
+	@read -p "Migration name: " name; \
+	cd backend && goose -dir migrations create $$name sql
+
+# ============================================
+# 前端
+# ============================================
+
+frontend-build:
+	cd frontend && bun install && bun run build
+
+frontend-dev:
+	cd frontend && bun dev
+
+frontend-test:
+	cd frontend && bun run test
+
+frontend-test-watch:
+	cd frontend && bun run test:watch
+
+frontend-test-coverage:
+	cd frontend && bun run test:coverage
+
+frontend-test-e2e:
+	cd frontend && bun run test:e2e
+
+frontend-lint:
+	cd frontend && bun run lint
+
+# ============================================
+# 桌面应用
+# ============================================
+
+desktop: frontend-build-desktop embedfs-prepare
+	cd backend && CGO_ENABLED=1 go build -o ../build/nex ./cmd/desktop
+
+frontend-build-desktop:
+	cd frontend && cp .env.desktop .env.production.local && bun install && bun run build && rm -f .env.production.local
+
+embedfs-prepare:
+	rm -rf embedfs/assets embedfs/frontend-dist
+	cp -r assets embedfs/assets
+	cp -r frontend/dist embedfs/frontend-dist
+
+desktop-darwin: frontend-build-desktop embedfs-prepare
+	cd backend && CGO_ENABLED=1 GOOS=darwin GOARCH=arm64 go build -o ../build/nex-darwin-arm64 ./cmd/desktop
+	cd backend && CGO_ENABLED=1 GOOS=darwin GOARCH=amd64 go build -o ../build/nex-darwin-amd64 ./cmd/desktop
+
+desktop-windows: frontend-build-desktop embedfs-prepare
+	cd backend && CGO_ENABLED=1 GOOS=windows GOARCH=amd64 go build -ldflags "-H=windowsgui" -o ../build/nex-windows-amd64.exe ./cmd/desktop
+
+desktop-linux: frontend-build-desktop embedfs-prepare
+	cd backend && CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o ../build/nex-linux-amd64 ./cmd/desktop
+
+package-macos:
+	./scripts/build/package-macos.sh
+
+# ============================================
+# 清理
+# ============================================
+
+clean:
+	rm -rf backend/bin/ backend/coverage.out backend/coverage.html
+	rm -rf build/
--- a/README.md
+++ b/README.md
@@ -7,7 +7,9 @@
 ```
 nex/
 ├── backend/              # Go 后端服务（分层架构）
-│   ├── cmd/server/       # 主程序入口
+│   ├── cmd/
+│   │   ├── server/       # CLI 主程序入口
+│   │   └── desktop/      # 桌面应用入口
 │   ├── internal/
 │   │   ├── handler/      # HTTP 处理器 + 中间件
 │   │   ├── service/      # 业务逻辑层
@@ -32,6 +34,15 @@ nex/
 │   ├── e2e/              # Playwright E2E 测试
 │   └── package.json
 │
+├── assets/               # 应用资源
+│   ├── icon.png          # 托盘图标
+│   ├── AppIcon.icns      # macOS 应用图标
+│   └── icon.ico          # Windows 应用图标
+│
+├── scripts/              # 构建脚本
+│   └── build/
+│       └── package-macos.sh  # macOS .app 打包脚本
+│
 └── README.md             # 本文件
 ```

@@ -72,7 +83,46 @@ nex/

 ## 快速开始

-### 后端
+### 桌面应用（推荐）
+
+**构建桌面应用**：
+
+```bash
+# 当前平台
+make desktop
+
+# macOS (arm64 + amd64)
+make desktop-darwin
+make package-macos  # 打包为 .app
+
+# Windows
+make desktop-windows
+
+# Linux
+make desktop-linux
+```
+
+**使用桌面应用**：
+- 双击启动应用（macOS: Nex.app，Windows: nex.exe，Linux: nex）
+- 系统托盘图标出现，浏览器自动打开管理界面
+- 点击托盘图标显示菜单，可打开管理界面或退出
+- 关闭浏览器后服务继续运行，可通过托盘重新打开
+
+**注意事项**：
+- 桌面应用需要 CGO 支持
+- macOS: 自带 Xcode Command Line Tools
+- Linux: 自带 gcc，部分桌面环境需要 `libappindicator3-dev`
+- Windows: 需要 MinGW-w64 或在 Windows 环境构建
+
+**Linux 桌面环境兼容性**：
+- GNOME: 需要 AppIndicator 扩展
+- KDE Plasma: 原生支持
+- Xfce: 需要 libappindicator
+- 其他支持 StatusNotifierItem 规范的环境
+
+### CLI 模式
+
+#### 后端

 ```bash
 cd backend
@@ -161,41 +211,24 @@ log:

 ## 测试

-### 后端测试
-
 ```bash
-cd backend
-make test              # 运行所有测试
-make test-coverage     # 生成覆盖率报告
-```
-
-### 前端测试
-
-```bash
-cd frontend
-bun run test            # 单元测试 + 组件测试
-bun run test:watch      # 监听模式
-bun run test:coverage   # 生成覆盖率报告
-bun run test:e2e        # E2E 测试
+make backend-test              # 后端测试
+make backend-test-coverage     # 后端覆盖率
+make frontend-test             # 前端测试
+make frontend-test-e2e         # 前端 E2E 测试
 ```

 ## 开发

-### 后端开发
-
 ```bash
-cd backend
-make build              # 构建
-make lint               # 代码检查
-make migrate-up         # 数据库迁移
-```
+make backend-build             # 构建后端
+make backend-run               # 运行后端
+make backend-lint              # 后端代码检查
+make backend-migrate-up        # 数据库迁移

-### 前端开发
-
-```bash
-cd frontend
-bun run build           # 构建生产版本
-bun run lint            # 代码检查
+make frontend-build            # 构建前端
+make frontend-dev              # 前端开发模式
+make frontend-lint             # 前端代码检查
 ```

 ## 开发规范
--- a/assets/AppIcon.icns
+++ b/assets/AppIcon.icns
--- a/assets/README.md
+++ b/assets/README.md
@@ -0,0 +1,64 @@
+# Assets
+
+应用资源文件目录。
+
+## 文件说明
+
+| 文件 | 用途 | 尺寸 | 格式 |
+|------|------|------|------|
+| `icon.svg` | 源图标 | 64x64 | SVG |
+| `icon.png` | 托盘图标 | 64x64 | PNG |
+| `AppIcon.icns` | macOS 应用图标 | 多尺寸 | ICNS |
+| `icon.ico` | Windows 应用图标 | 256x256 | ICO |
+
+## 替换图标
+
+### 1. 准备图标
+
+推荐使用 SVG 格式的源图标，尺寸至少 256x256。
+
+### 2. 生成各平台图标
+
+**托盘图标 (PNG)**：
+```bash
+magick your-icon.svg -resize 64x64 icon.png
+```
+
+**macOS 应用图标 (ICNS)**：
+```bash
+mkdir icon.iconset
+magick your-icon.svg -resize 16x16 icon.iconset/icon_16x16.png
+magick your-icon.svg -resize 32x32 icon.iconset/icon_16x16@2x.png
+magick your-icon.svg -resize 32x32 icon.iconset/icon_32x32.png
+magick your-icon.svg -resize 64x64 icon.iconset/icon_32x32@2x.png
+magick your-icon.svg -resize 128x128 icon.iconset/icon_128x128.png
+magick your-icon.svg -resize 256x256 icon.iconset/icon_128x128@2x.png
+iconutil -c icns icon.iconset -o AppIcon.icns
+rm -rf icon.iconset
+```
+
+**Windows 应用图标 (ICO)**：
+```bash
+magick your-icon.svg -resize 256x256 icon.ico
+```
+
+### 3. 替换文件
+
+将生成的文件放入此目录，然后重新构建桌面应用：
+```bash
+./scripts/build/build-darwin-arm64.sh
+```
+
+## macOS Template 图标
+
+macOS 支持 Template 图标，自动适配深浅色模式：
+- 使用黑色 + 透明设计
+- 文件名以 `Template` 结尾（如 `iconTemplate.png`）
+- 黑色在深色模式下自动变为白色
+
+## 设计建议
+
+- 托盘图标应简洁，在小尺寸下清晰可辨
+- 避免过多细节和文字
+- 使用高对比度颜色
+- macOS 建议使用 Template 图标风格
--- a/assets/icon.ico
+++ b/assets/icon.ico
--- a/assets/icon.png
+++ b/assets/icon.png
--- a/assets/icon.svg
+++ b/assets/icon.svg
@@ -0,0 +1,13 @@
+<svg width="64" height="64" viewBox="0 0 64 64" xmlns="http://www.w3.org/2000/svg">
+  <rect width="64" height="64" rx="12" fill="#4A90D9"/>
+  <polygon points="32,8 52,20 52,44 32,56 12,44 12,20" fill="none" stroke="white" stroke-width="3"/>
+  <circle cx="32" cy="32" r="6" fill="white"/>
+  <line x1="32" y1="32" x2="20" y2="20" stroke="white" stroke-width="2"/>
+  <line x1="32" y1="32" x2="44" y2="20" stroke="white" stroke-width="2"/>
+  <line x1="32" y1="32" x2="20" y2="44" stroke="white" stroke-width="2"/>
+  <line x1="32" y1="32" x2="44" y2="44" stroke="white" stroke-width="2"/>
+  <circle cx="20" cy="20" r="3" fill="white"/>
+  <circle cx="44" cy="20" r="3" fill="white"/>
+  <circle cx="20" cy="44" r="3" fill="white"/>
+  <circle cx="44" cy="44" r="3" fill="white"/>
+</svg>
--- a/backend/Makefile
+++ b/backend/Makefile
@@ -1,57 +0,0 @@
-.PHONY: build run test test-unit test-integration test-coverage clean migrate-up migrate-down migrate-status migrate-create lint generate deps
-
-# 构建
-build:
-	go build -o bin/server ./cmd/server
-
-# 运行
-run:
-	go run ./cmd/server
-
-# 测试
-test:
-	go test ./... -v
-
-# 单元测试
-test-unit:
-	go test ./internal/... ./pkg/... -v
-
-# 集成测试
-test-integration:
-	go test ./tests/... -v
-
-# 测试覆盖率
-test-coverage:
-	go test ./... -coverprofile=coverage.out
-	go tool cover -html=coverage.out -o coverage.html
-	@echo "Coverage report generated: coverage.html"
-
-# 清理
-clean:
-	rm -rf bin/ coverage.out coverage.html
-
-# 数据库迁移
-migrate-up:
-	goose -dir migrations sqlite3 $(DB_PATH) up
-
-migrate-down:
-	goose -dir migrations sqlite3 $(DB_PATH) down
-
-migrate-status:
-	goose -dir migrations sqlite3 $(DB_PATH) status
-
-migrate-create:
-	@read -p "Migration name: " name; \
-	goose -dir migrations create $$name sql
-
-# 代码检查
-lint:
-	go tool golangci-lint run ./...
-
-# 安装依赖
-deps:
-	go mod tidy
-
-# 生成代码（mock 等）
-generate:
-	go generate ./...
--- a/backend/cmd/desktop/main.go
+++ b/backend/cmd/desktop/main.go
@@ -0,0 +1,456 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"io/fs"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/getlantern/systray"
+	"github.com/pressly/goose/v3"
+	"go.uber.org/zap"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+
+	"nex/backend/internal/config"
+	"nex/backend/internal/conversion"
+	"nex/backend/internal/conversion/anthropic"
+	"nex/backend/internal/conversion/openai"
+	"nex/backend/internal/handler"
+	"nex/backend/internal/handler/middleware"
+	"nex/backend/internal/provider"
+	"nex/backend/internal/repository"
+	"nex/backend/internal/service"
+	pkgLogger "nex/backend/pkg/logger"
+
+	"nex/embedfs"
+)
+
+var (
+	server         *http.Server
+	zapLogger      *zap.Logger
+	shutdownCtx    context.Context
+	shutdownCancel context.CancelFunc
+)
+
+func main() {
+	port := 9826
+
+	if err := acquireSingleInstance(); err != nil {
+		showError("Nex Gateway", "已有 Nex 实例运行")
+		os.Exit(1)
+	}
+	defer releaseSingleInstance()
+
+	if err := checkPortAvailable(port); err != nil {
+		showError("Nex Gateway", err.Error())
+		os.Exit(1)
+	}
+
+	cfg, err := config.LoadConfig()
+	if err != nil {
+		showError("Nex Gateway", fmt.Sprintf("加载配置失败: %v", err))
+		os.Exit(1)
+	}
+
+	zapLogger, err = pkgLogger.New(pkgLogger.Config{
+		Level:      cfg.Log.Level,
+		Path:       cfg.Log.Path,
+		MaxSize:    cfg.Log.MaxSize,
+		MaxBackups: cfg.Log.MaxBackups,
+		MaxAge:     cfg.Log.MaxAge,
+		Compress:   cfg.Log.Compress,
+	})
+	if err != nil {
+		showError("Nex Gateway", fmt.Sprintf("初始化日志失败: %v", err))
+		os.Exit(1)
+	}
+	defer zapLogger.Sync()
+
+	db, err := initDatabase(cfg)
+	if err != nil {
+		showError("Nex Gateway", fmt.Sprintf("初始化数据库失败: %v", err))
+		os.Exit(1)
+	}
+	defer closeDB(db)
+
+	providerRepo := repository.NewProviderRepository(db)
+	modelRepo := repository.NewModelRepository(db)
+	statsRepo := repository.NewStatsRepository(db)
+
+	providerService := service.NewProviderService(providerRepo, modelRepo)
+	modelService := service.NewModelService(modelRepo, providerRepo)
+	routingService := service.NewRoutingService(modelRepo, providerRepo)
+	statsService := service.NewStatsService(statsRepo)
+
+	registry := conversion.NewMemoryRegistry()
+	if err := registry.Register(openai.NewAdapter()); err != nil {
+		zapLogger.Fatal("注册 OpenAI 适配器失败", zap.String("error", err.Error()))
+	}
+	if err := registry.Register(anthropic.NewAdapter()); err != nil {
+		zapLogger.Fatal("注册 Anthropic 适配器失败", zap.String("error", err.Error()))
+	}
+	engine := conversion.NewConversionEngine(registry, zapLogger)
+
+	providerClient := provider.NewClient()
+
+	proxyHandler := handler.NewProxyHandler(engine, providerClient, routingService, providerService, statsService)
+	providerHandler := handler.NewProviderHandler(providerService)
+	modelHandler := handler.NewModelHandler(modelService)
+	statsHandler := handler.NewStatsHandler(statsService)
+
+	gin.SetMode(gin.ReleaseMode)
+	r := gin.New()
+
+	r.Use(middleware.RequestID())
+	r.Use(middleware.Recovery(zapLogger))
+	r.Use(middleware.Logging(zapLogger))
+	r.Use(middleware.CORS())
+
+	setupRoutes(r, proxyHandler, providerHandler, modelHandler, statsHandler)
+	setupStaticFiles(r)
+
+	server = &http.Server{
+		Addr:         fmt.Sprintf(":%d", port),
+		Handler:      r,
+		ReadTimeout:  cfg.Server.ReadTimeout,
+		WriteTimeout: cfg.Server.WriteTimeout,
+	}
+
+	shutdownCtx, shutdownCancel = context.WithCancel(context.Background())
+
+	go func() {
+		zapLogger.Info("AI Gateway 启动", zap.String("addr", server.Addr))
+		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			zapLogger.Fatal("服务器启动失败", zap.String("error", err.Error()))
+		}
+	}()
+
+	go func() {
+		time.Sleep(500 * time.Millisecond)
+		if err := openBrowser(fmt.Sprintf("http://localhost:%d", port)); err != nil {
+			zapLogger.Warn("无法打开浏览器", zap.String("error", err.Error()))
+		}
+	}()
+
+	setupSystray(port)
+}
+
+func initDatabase(cfg *config.Config) (*gorm.DB, error) {
+	dbDir := filepath.Dir(cfg.Database.Path)
+	if err := os.MkdirAll(dbDir, 0755); err != nil {
+		return nil, fmt.Errorf("创建数据库目录失败: %w", err)
+	}
+
+	db, err := gorm.Open(sqlite.Open(cfg.Database.Path), &gorm.Config{
+		Logger: logger.Default.LogMode(logger.Info),
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	if err := runMigrations(db); err != nil {
+		return nil, fmt.Errorf("数据库迁移失败: %w", err)
+	}
+
+	if err := db.Exec("PRAGMA journal_mode=WAL").Error; err != nil {
+		log.Printf("警告: 启用 WAL 模式失败: %v", err)
+	}
+
+	sqlDB, err := db.DB()
+	if err != nil {
+		return nil, err
+	}
+	sqlDB.SetMaxIdleConns(cfg.Database.MaxIdleConns)
+	sqlDB.SetMaxOpenConns(cfg.Database.MaxOpenConns)
+	sqlDB.SetConnMaxLifetime(cfg.Database.ConnMaxLifetime)
+
+	return db, nil
+}
+
+func runMigrations(db *gorm.DB) error {
+	sqlDB, err := db.DB()
+	if err != nil {
+		return err
+	}
+
+	migrationsDir := getMigrationsDir()
+	if _, err := os.Stat(migrationsDir); os.IsNotExist(err) {
+		return fmt.Errorf("迁移目录不存在: %s", migrationsDir)
+	}
+
+	goose.SetDialect("sqlite3")
+	if err := goose.Up(sqlDB, migrationsDir); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func getMigrationsDir() string {
+	_, filename, _, ok := runtime.Caller(0)
+	if ok {
+		dir := filepath.Join(filepath.Dir(filename), "..", "..", "migrations")
+		if abs, err := filepath.Abs(dir); err == nil {
+			return abs
+		}
+	}
+	return "./migrations"
+}
+
+func closeDB(db *gorm.DB) {
+	sqlDB, err := db.DB()
+	if err != nil {
+		return
+	}
+	sqlDB.Close()
+}
+
+func setupRoutes(r *gin.Engine, proxyHandler *handler.ProxyHandler, providerHandler *handler.ProviderHandler, modelHandler *handler.ModelHandler, statsHandler *handler.StatsHandler) {
+	r.Any("/v1/*path", proxyHandler.HandleProxy)
+
+	providers := r.Group("/api/providers")
+	{
+		providers.GET("", providerHandler.ListProviders)
+		providers.POST("", providerHandler.CreateProvider)
+		providers.GET("/:id", providerHandler.GetProvider)
+		providers.PUT("/:id", providerHandler.UpdateProvider)
+		providers.DELETE("/:id", providerHandler.DeleteProvider)
+	}
+
+	models := r.Group("/api/models")
+	{
+		models.GET("", modelHandler.ListModels)
+		models.POST("", modelHandler.CreateModel)
+		models.GET("/:id", modelHandler.GetModel)
+		models.PUT("/:id", modelHandler.UpdateModel)
+		models.DELETE("/:id", modelHandler.DeleteModel)
+	}
+
+	stats := r.Group("/api/stats")
+	{
+		stats.GET("", statsHandler.GetStats)
+		stats.GET("/aggregate", statsHandler.AggregateStats)
+	}
+
+	r.GET("/health", func(c *gin.Context) {
+		c.JSON(200, gin.H{"status": "ok"})
+	})
+}
+
+func setupStaticFiles(r *gin.Engine) {
+	distFS, err := fs.Sub(embedfs.FrontendDist, "frontend-dist")
+	if err != nil {
+		zapLogger.Fatal("无法加载前端资源", zap.String("error", err.Error()))
+	}
+
+	getContentType := func(path string) string {
+		if strings.HasSuffix(path, ".js") {
+			return "application/javascript"
+		}
+		if strings.HasSuffix(path, ".css") {
+			return "text/css"
+		}
+		if strings.HasSuffix(path, ".svg") {
+			return "image/svg+xml"
+		}
+		if strings.HasSuffix(path, ".png") {
+			return "image/png"
+		}
+		if strings.HasSuffix(path, ".ico") {
+			return "image/x-icon"
+		}
+		if strings.HasSuffix(path, ".woff") || strings.HasSuffix(path, ".woff2") {
+			return "font/woff2"
+		}
+		return "application/octet-stream"
+	}
+
+	r.GET("/assets/*filepath", func(c *gin.Context) {
+		filepath := c.Param("filepath")
+		data, err := fs.ReadFile(distFS, "assets"+filepath)
+		if err != nil {
+			c.Status(404)
+			return
+		}
+		c.Data(200, getContentType(filepath), data)
+	})
+
+	r.GET("/favicon.svg", func(c *gin.Context) {
+		data, err := fs.ReadFile(distFS, "favicon.svg")
+		if err != nil {
+			c.Status(404)
+			return
+		}
+		c.Data(200, "image/svg+xml", data)
+	})
+
+	r.NoRoute(func(c *gin.Context) {
+		path := c.Request.URL.Path
+
+		if strings.HasPrefix(path, "/api/") ||
+			strings.HasPrefix(path, "/v1/") ||
+			strings.HasPrefix(path, "/health") {
+			c.JSON(404, gin.H{"error": "not found"})
+			return
+		}
+
+		data, err := fs.ReadFile(distFS, "index.html")
+		if err != nil {
+			c.Status(500)
+			return
+		}
+		c.Data(200, "text/html; charset=utf-8", data)
+	})
+}
+
+func setupSystray(port int) {
+	systray.Run(func() {
+		icon, err := embedfs.Assets.ReadFile("assets/icon.png")
+		if err != nil {
+			zapLogger.Error("无法加载托盘图标", zap.String("error", err.Error()))
+		}
+		systray.SetIcon(icon)
+		systray.SetTitle("Nex Gateway")
+		systray.SetTooltip("AI Gateway")
+
+		mOpen := systray.AddMenuItem("打开管理界面", "在浏览器中打开")
+		systray.AddSeparator()
+		mStatus := systray.AddMenuItem("状态: 运行中", "")
+		mStatus.Disable()
+		mPort := systray.AddMenuItem(fmt.Sprintf("端口: %d", port), "")
+		mPort.Disable()
+		systray.AddSeparator()
+		mAbout := systray.AddMenuItem("关于", "")
+		systray.AddSeparator()
+		mQuit := systray.AddMenuItem("退出", "停止服务并退出")
+
+		go func() {
+			for {
+				select {
+				case <-mOpen.ClickedCh:
+					openBrowser(fmt.Sprintf("http://localhost:%d", port))
+				case <-mAbout.ClickedCh:
+					showAbout()
+				case <-mQuit.ClickedCh:
+					doShutdown()
+					systray.Quit()
+					return
+				}
+			}
+		}()
+	}, nil)
+}
+
+func doShutdown() {
+	if zapLogger != nil {
+		zapLogger.Info("正在关闭服务器...")
+	}
+
+	if server != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		server.Shutdown(ctx)
+	}
+
+	if shutdownCancel != nil {
+		shutdownCancel()
+	}
+}
+
+func checkPortAvailable(port int) error {
+	ln, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
+	if err != nil {
+		return fmt.Errorf("端口 %d 已被占用\n\n可能原因:\n- 已有 Nex 实例运行\n- 其他程序占用了该端口\n\n请检查并关闭占用端口的程序", port)
+	}
+	ln.Close()
+	return nil
+}
+
+var lockFile *os.File
+
+func acquireSingleInstance() error {
+	lockPath := filepath.Join(os.TempDir(), "nex-gateway.lock")
+
+	f, err := os.OpenFile(lockPath, os.O_CREATE|os.O_RDWR, 0666)
+	if err != nil {
+		return err
+	}
+
+	err = syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB)
+	if err != nil {
+		f.Close()
+		return fmt.Errorf("已有实例运行")
+	}
+
+	lockFile = f
+	return nil
+}
+
+func releaseSingleInstance() {
+	if lockFile != nil {
+		syscall.Flock(int(lockFile.Fd()), syscall.LOCK_UN)
+		lockFile.Close()
+	}
+}
+
+func openBrowser(url string) error {
+	var cmd *exec.Cmd
+
+	switch runtime.GOOS {
+	case "darwin":
+		cmd = exec.Command("open", url)
+	case "windows":
+		cmd = exec.Command("rundll32", "url.dll,FileProtocolHandler", url)
+	case "linux":
+		browsers := []string{"xdg-open", "google-chrome", "firefox"}
+		for _, browser := range browsers {
+			if _, err := exec.LookPath(browser); err == nil {
+				cmd = exec.Command(browser, url)
+				break
+			}
+		}
+	}
+
+	if cmd == nil {
+		return fmt.Errorf("无法打开浏览器")
+	}
+
+	return cmd.Start()
+}
+
+func showError(title, message string) {
+	switch runtime.GOOS {
+	case "darwin":
+		script := fmt.Sprintf(`display dialog "%s" buttons {"OK"} default button "OK" with title "%s"`, message, title)
+		exec.Command("osascript", "-e", script).Run()
+	case "windows":
+		exec.Command("msg", "*", message).Run()
+	case "linux":
+		exec.Command("zenity", "--error", fmt.Sprintf("--title=%s", title), fmt.Sprintf("--text=%s", message)).Run()
+	}
+}
+
+func showAbout() {
+	message := "Nex Gateway\n\nAI Gateway - 统一的大模型 API 网关\n\nhttps://github.com/nex/gateway"
+	switch runtime.GOOS {
+	case "darwin":
+		script := fmt.Sprintf(`display dialog "%s" buttons {"OK"} default button "OK" with title "关于 Nex Gateway"`, message)
+		exec.Command("osascript", "-e", script).Run()
+	case "windows":
+		exec.Command("msg", "*", message).Run()
+	case "linux":
+		exec.Command("zenity", "--info", "--title=关于 Nex Gateway", fmt.Sprintf("--text=%s", message)).Run()
+	}
+}
--- a/backend/cmd/desktop/port_test.go
+++ b/backend/cmd/desktop/port_test.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	"net"
+	"net/http"
+	"testing"
+	"time"
+)
+
+func TestCheckPortAvailable(t *testing.T) {
+	port := 19826
+
+	err := checkPortAvailable(port)
+	if err != nil {
+		t.Fatalf("端口 %d 应该可用: %v", port, err)
+	}
+
+	t.Log("端口可用测试通过")
+}
+
+func TestCheckPortOccupied(t *testing.T) {
+	port := 19827
+
+	listener, err := net.Listen("tcp", ":19827")
+	if err != nil {
+		t.Fatalf("无法启动测试服务器: %v", err)
+	}
+	defer listener.Close()
+
+	go func() {
+		conn, err := listener.Accept()
+		if err == nil {
+			conn.Close()
+		}
+	}()
+
+	time.Sleep(100 * time.Millisecond)
+
+	err = checkPortAvailable(port)
+	if err == nil {
+		t.Fatal("端口被占用时应该返回错误")
+	}
+
+	t.Log("端口占用检测测试通过")
+}
+
+func TestCheckPortAvailableAfterClose(t *testing.T) {
+	port := 19828
+
+	listener, err := net.Listen("tcp", ":19828")
+	if err != nil {
+		t.Fatalf("无法启动测试服务器: %v", err)
+	}
+
+	server := &http.Server{}
+	go server.Serve(listener)
+
+	time.Sleep(100 * time.Millisecond)
+
+	listener.Close()
+	time.Sleep(100 * time.Millisecond)
+
+	err = checkPortAvailable(port)
+	if err != nil {
+		t.Fatalf("端口关闭后应该可用: %v", err)
+	}
+
+	t.Log("端口关闭后可用测试通过")
+}
--- a/backend/cmd/desktop/singleton_test.go
+++ b/backend/cmd/desktop/singleton_test.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"syscall"
+	"testing"
+)
+
+func TestAcquireSingleInstance(t *testing.T) {
+	lockPath := filepath.Join(os.TempDir(), "nex-gateway-test.lock")
+	
+	origLockFile := lockFile
+	lockFile = nil
+	defer func() { lockFile = origLockFile }()
+
+	f, err := os.OpenFile(lockPath, os.O_CREATE|os.O_RDWR, 0666)
+	if err != nil {
+		t.Fatalf("无法创建锁文件: %v", err)
+	}
+	defer f.Close()
+	defer os.Remove(lockPath)
+
+	err = syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB)
+	if err != nil {
+		t.Fatalf("无法获取文件锁: %v", err)
+	}
+	defer syscall.Flock(int(f.Fd()), syscall.LOCK_UN)
+
+	t.Log("单实例锁测试通过")
+}
+
+func TestReleaseSingleInstance(t *testing.T) {
+	lockFile = nil
+	
+	releaseSingleInstance()
+	
+	t.Log("释放空锁测试通过")
+}
--- a/backend/cmd/desktop/static_test.go
+++ b/backend/cmd/desktop/static_test.go
@@ -0,0 +1,123 @@
+package main
+
+import (
+	"io/fs"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+
+	"nex/embedfs"
+)
+
+func TestSetupStaticFiles(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	distFS, err := fs.Sub(embedfs.FrontendDist, "frontend-dist")
+	if err != nil {
+		t.Skipf("跳过测试: 前端资源未构建: %v", err)
+		return
+	}
+
+	getContentType := func(path string) string {
+		if strings.HasSuffix(path, ".js") {
+			return "application/javascript"
+		}
+		if strings.HasSuffix(path, ".css") {
+			return "text/css"
+		}
+		if strings.HasSuffix(path, ".svg") {
+			return "image/svg+xml"
+		}
+		return "application/octet-stream"
+	}
+
+	r := gin.New()
+	r.GET("/assets/*filepath", func(c *gin.Context) {
+		filepath := c.Param("filepath")
+		data, err := fs.ReadFile(distFS, "assets"+filepath)
+		if err != nil {
+			c.Status(404)
+			return
+		}
+		c.Data(200, getContentType(filepath), data)
+	})
+
+	r.GET("/favicon.svg", func(c *gin.Context) {
+		data, err := fs.ReadFile(distFS, "favicon.svg")
+		if err != nil {
+			c.Status(404)
+			return
+		}
+		c.Data(200, "image/svg+xml", data)
+	})
+
+	r.NoRoute(func(c *gin.Context) {
+		path := c.Request.URL.Path
+		if strings.HasPrefix(path, "/api/") ||
+			strings.HasPrefix(path, "/v1/") ||
+			strings.HasPrefix(path, "/health") {
+			c.JSON(404, gin.H{"error": "not found"})
+			return
+		}
+		data, err := fs.ReadFile(distFS, "index.html")
+		if err != nil {
+			c.Status(500)
+			return
+		}
+		c.Data(200, "text/html; charset=utf-8", data)
+	})
+
+	t.Run("API 404", func(t *testing.T) {
+		req := httptest.NewRequest("GET", "/api/test", nil)
+		w := httptest.NewRecorder()
+		r.ServeHTTP(w, req)
+
+		if w.Code != 404 {
+			t.Errorf("期望状态码 404, 实际 %d", w.Code)
+		}
+	})
+
+	t.Run("SPA fallback", func(t *testing.T) {
+		req := httptest.NewRequest("GET", "/providers", nil)
+		w := httptest.NewRecorder()
+		r.ServeHTTP(w, req)
+
+		if w.Code != 200 {
+			t.Errorf("期望状态码 200, 实际 %d", w.Code)
+		}
+	})
+
+	t.Run("MIME type for JS", func(t *testing.T) {
+		req := httptest.NewRequest("GET", "/assets/test.js", nil)
+		w := httptest.NewRecorder()
+		r.ServeHTTP(w, req)
+
+		if w.Code == 200 {
+			expected := "application/javascript"
+			if w.Header().Get("Content-Type") != expected {
+				t.Errorf("期望 Content-Type %s, 实际 %s", expected, w.Header().Get("Content-Type"))
+			}
+		} else {
+			t.Log("文件不存在，跳过 MIME 类型验证")
+		}
+	})
+
+	t.Run("MIME type for CSS", func(t *testing.T) {
+		req := httptest.NewRequest("GET", "/assets/test.css", nil)
+		w := httptest.NewRecorder()
+		r.ServeHTTP(w, req)
+
+		if w.Code == 200 {
+			expected := "text/css"
+			if w.Header().Get("Content-Type") != expected {
+				t.Errorf("期望 Content-Type %s, 实际 %s", expected, w.Header().Get("Content-Type"))
+			}
+		} else {
+			t.Log("文件不存在，跳过 MIME 类型验证")
+		}
+	})
+
+	t.Log("静态文件服务测试通过")
+}
--- a/backend/go.mod
+++ b/backend/go.mod
@@ -2,12 +2,15 @@ module nex/backend

 go 1.26.2

+replace nex/embedfs => ../embedfs
+
 tool (
 	github.com/golangci/golangci-lint/cmd/golangci-lint
 	go.uber.org/mock/mockgen
 )

 require (
+	github.com/getlantern/systray v1.2.2
 	github.com/gin-gonic/gin v1.12.0
 	github.com/go-playground/validator/v10 v10.30.2
 	github.com/google/uuid v1.6.0
@@ -22,6 +25,7 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 	gorm.io/driver/sqlite v1.6.0
 	gorm.io/gorm v1.31.1
+	nex/embedfs v0.0.0-00010101000000-000000000000
 )

 require (
@@ -74,11 +78,18 @@ require (
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
 	github.com/fzipp/gocyclo v0.6.0 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.13 // indirect
+	github.com/getlantern/context v0.0.0-20190109183933-c447772a6520 // indirect
+	github.com/getlantern/errors v0.0.0-20190325191628-abdb3e3e36f7 // indirect
+	github.com/getlantern/golog v0.0.0-20190830074920-4ef2e798c2d7 // indirect
+	github.com/getlantern/hex v0.0.0-20190417191902-c6586a6fe0b7 // indirect
+	github.com/getlantern/hidden v0.0.0-20190325191715-f02dbb02be55 // indirect
+	github.com/getlantern/ops v0.0.0-20190325191751-d70cb0d6f85f // indirect
 	github.com/ghostiam/protogetter v0.3.9 // indirect
 	github.com/gin-contrib/sse v1.1.0 // indirect
 	github.com/go-critic/go-critic v0.12.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-stack/stack v1.8.0 // indirect
 	github.com/go-toolsmith/astcast v1.1.0 // indirect
 	github.com/go-toolsmith/astcopy v1.1.0 // indirect
 	github.com/go-toolsmith/astequal v1.2.0 // indirect
@@ -153,6 +164,7 @@ require (
 	github.com/nishanths/predeclared v0.2.2 // indirect
 	github.com/nunnatsa/ginkgolinter v0.19.1 // indirect
 	github.com/olekukonko/tablewriter v0.0.5 // indirect
+	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/polyfloyd/go-errorlint v1.7.1 // indirect
--- a/backend/go.sum
+++ b/backend/go.sum
@@ -163,6 +163,20 @@ github.com/fzipp/gocyclo v0.6.0 h1:lsblElZG7d3ALtGMx9fmxeTKZaLLpU8mET09yN4BBLo=
 github.com/fzipp/gocyclo v0.6.0/go.mod h1:rXPyn8fnlpa0R2csP/31uerbiVBugk5whMdlyaLkLoA=
 github.com/gabriel-vasile/mimetype v1.4.13 h1:46nXokslUBsAJE/wMsp5gtO500a4F3Nkz9Ufpk2AcUM=
 github.com/gabriel-vasile/mimetype v1.4.13/go.mod h1:d+9Oxyo1wTzWdyVUPMmXFvp4F9tea18J8ufA774AB3s=
+github.com/getlantern/context v0.0.0-20190109183933-c447772a6520 h1:NRUJuo3v3WGC/g5YiyF790gut6oQr5f3FBI88Wv0dx4=
+github.com/getlantern/context v0.0.0-20190109183933-c447772a6520/go.mod h1:L+mq6/vvYHKjCX2oez0CgEAJmbq1fbb/oNJIWQkBybY=
+github.com/getlantern/errors v0.0.0-20190325191628-abdb3e3e36f7 h1:6uJ+sZ/e03gkbqZ0kUG6mfKoqDb4XMAzMIwlajq19So=
+github.com/getlantern/errors v0.0.0-20190325191628-abdb3e3e36f7/go.mod h1:l+xpFBrCtDLpK9qNjxs+cHU6+BAdlBaxHqikB6Lku3A=
+github.com/getlantern/golog v0.0.0-20190830074920-4ef2e798c2d7 h1:guBYzEaLz0Vfc/jv0czrr2z7qyzTOGC9hiQ0VC+hKjk=
+github.com/getlantern/golog v0.0.0-20190830074920-4ef2e798c2d7/go.mod h1:zx/1xUUeYPy3Pcmet8OSXLbF47l+3y6hIPpyLWoR9oc=
+github.com/getlantern/hex v0.0.0-20190417191902-c6586a6fe0b7 h1:micT5vkcr9tOVk1FiH8SWKID8ultN44Z+yzd2y/Vyb0=
+github.com/getlantern/hex v0.0.0-20190417191902-c6586a6fe0b7/go.mod h1:dD3CgOrwlzca8ed61CsZouQS5h5jIzkK9ZWrTcf0s+o=
+github.com/getlantern/hidden v0.0.0-20190325191715-f02dbb02be55 h1:XYzSdCbkzOC0FDNrgJqGRo8PCMFOBFL9py72DRs7bmc=
+github.com/getlantern/hidden v0.0.0-20190325191715-f02dbb02be55/go.mod h1:6mmzY2kW1TOOrVy+r41Za2MxXM+hhqTtY3oBKd2AgFA=
+github.com/getlantern/ops v0.0.0-20190325191751-d70cb0d6f85f h1:wrYrQttPS8FHIRSlsrcuKazukx/xqO/PpLZzZXsF+EA=
+github.com/getlantern/ops v0.0.0-20190325191751-d70cb0d6f85f/go.mod h1:D5ao98qkA6pxftxoqzibIBBrLSUli+kYnJqrgBf9cIA=
+github.com/getlantern/systray v1.2.2 h1:dCEHtfmvkJG7HZ8lS/sLklTH4RKUcIsKrAD9sThoEBE=
+github.com/getlantern/systray v1.2.2/go.mod h1:pXFOI1wwqwYXEhLPm9ZGjS2u/vVELeIgNMY5HvhHhcE=
 github.com/ghostiam/protogetter v0.3.9 h1:j+zlLLWzqLay22Cz/aYwTHKQ88GE2DQ6GkWSYFOI4lQ=
 github.com/ghostiam/protogetter v0.3.9/go.mod h1:WZ0nw9pfzsgxuRsPOFQomgDVSWtDLJRfQJEhsGbmQMA=
 github.com/gin-contrib/sse v1.1.0 h1:n0w2GMuUpWDVp7qSpvze6fAu9iRxJY4Hmj6AmBOU05w=
@@ -192,6 +206,7 @@ github.com/go-playground/validator/v10 v10.30.2 h1:JiFIMtSSHb2/XBUbWM4i/MpeQm9ZK
 github.com/go-playground/validator/v10 v10.30.2/go.mod h1:mAf2pIOVXjTEBrwUMGKkCWKKPs9NheYGabeB04txQSc=
 github.com/go-quicktest/qt v1.101.0 h1:O1K29Txy5P2OK0dGo59b7b0LR6wKfIhttaAhHUyn7eI=
 github.com/go-quicktest/qt v1.101.0/go.mod h1:14Bz/f7NwaXPtdYEgzsx46kqSxVwTbzVZsDC26tQJow=
+github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1vB6EwHI=
 github.com/go-task/slim-sprig/v3 v3.0.0/go.mod h1:W848ghGpv3Qj3dhTPRyJypKRiqCdHZiAzKg9hl15HA8=
@@ -397,6 +412,8 @@ github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
 github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
 github.com/leonklingele/grouper v1.1.2 h1:o1ARBDLOmmasUaNDesWqWCIFH3u7hoFlM84YrjT3mIY=
 github.com/leonklingele/grouper v1.1.2/go.mod h1:6D0M/HVkhs2yRKRFZUoGjeDy7EZTfFBE9gl4kjmIGkA=
+github.com/lxn/walk v0.0.0-20210112085537-c389da54e794/go.mod h1:E23UucZGqpuUANJooIbHWCufXvOcT6E7Stq81gU+CSQ=
+github.com/lxn/win v0.0.0-20210218163916-a377121e959e/go.mod h1:KxxjdtRkfNoYDCUP5ryK7XJJNTnpC8atvtmTheChOtk=
 github.com/macabu/inamedparam v0.1.3 h1:2tk/phHkMlEL/1GNe/Yf6kkR/hkcUdAEY3L0hjYV1Mk=
 github.com/macabu/inamedparam v0.1.3/go.mod h1:93FLICAIk/quk7eaPPQvbzihUdn/QkGDwIZEoLtpH6I=
 github.com/maratori/testableexamples v1.0.0 h1:dU5alXRrD8WKSjOUnmJZuzdxWOEQ57+7s93SLMxb2vI=
@@ -460,6 +477,8 @@ github.com/otiai10/curr v0.0.0-20150429015615-9b4961190c95/go.mod h1:9qAhocn7zKJ
 github.com/otiai10/curr v1.0.0/go.mod h1:LskTG5wDwr8Rs+nNQ+1LlxRjAtTZZjtJW4rMXl6j4vs=
 github.com/otiai10/mint v1.3.0/go.mod h1:F5AjcsTsWUqX+Na9fpHb52P8pcRX2CI6A3ctIT91xUo=
 github.com/otiai10/mint v1.3.1/go.mod h1:/yxELlJQ0ufhjUwhshSj+wFjZ78CnZ48/1wtmBH1OTc=
+github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c h1:rp5dCmg/yLR3mgFuSOe4oEnDDmGLROTvMragMUXpTQw=
+github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c/go.mod h1:X07ZCGwUbLaax7L0S3Tw4hpejzu63ZrrQiUe6W0hcy0=
 github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
 github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
@@ -551,6 +570,7 @@ github.com/sivchari/containedctx v1.0.3 h1:x+etemjbsh2fB5ewm5FeLNi5bUjK0V8n0RB+W
 github.com/sivchari/containedctx v1.0.3/go.mod h1:c1RDvCbnJLtH4lLcYD/GqwiBSSf4F5Qk0xld2rBqzJ4=
 github.com/sivchari/tenv v1.12.1 h1:+E0QzjktdnExv/wwsnnyk4oqZBUfuh89YMQT1cyuvSY=
 github.com/sivchari/tenv v1.12.1/go.mod h1:1LjSOUCc25snIr5n3DtGGrENhX3LuWefcplwVGC24mw=
+github.com/skratchdot/open-golang v0.0.0-20200116055534-eef842397966/go.mod h1:sUM3LWHvSMaG192sy56D9F7CNvL7jUJVXoqM1QKLnog=
 github.com/sonatard/noctx v0.1.0 h1:JjqOc2WN16ISWAjAk8M5ej0RfExEXtkEyExl2hLW+OM=
 github.com/sonatard/noctx v0.1.0/go.mod h1:0RvBxqY8D4j9cTTTWE8ylt2vqj2EPI8fHmrxHdsaZ2c=
 github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 h1:+jumHNA0Wrelhe64i8F6HNlS8pkoyMv5sreGx2Ry5Rw=
@@ -819,6 +839,7 @@ golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200803210538-64077c9b5642/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201018230417-eeed37f84f13/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -832,6 +853,7 @@ golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -1008,6 +1030,7 @@ google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp0
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
 google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+gopkg.in/Knetic/govaluate.v3 v3.0.0/go.mod h1:csKLBORsPbafmSCGTEh3U7Ozmsuq8ZSIlKk1bcqph0E=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
--- a/embedfs/embedfs.go
+++ b/embedfs/embedfs.go
@@ -0,0 +1,9 @@
+package embedfs
+
+import "embed"
+
+//go:embed assets/*
+var Assets embed.FS
+
+//go:embed frontend-dist/*
+var FrontendDist embed.FS
--- a/embedfs/go.mod
+++ b/embedfs/go.mod
@@ -0,0 +1,3 @@
+module nex/embedfs
+
+go 1.26.2
--- a/frontend/.env.desktop
+++ b/frontend/.env.desktop
@@ -0,0 +1 @@
+VITE_API_BASE=
--- a/go.work
+++ b/go.work
@@ -0,0 +1,6 @@
+go 1.26.2
+
+use (
+	backend
+	embedfs
+)
--- a/go.work.sum
+++ b/go.work.sum
@@ -0,0 +1,104 @@
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--- a/openspec/specs/desktop-app/spec.md
+++ b/openspec/specs/desktop-app/spec.md
@@ -0,0 +1,123 @@
+# 桌面应用
+
+## Purpose
+
+TBD - 提供跨平台桌面应用支持，将后端服务与前端静态资源打包为单一可执行文件
+
+## Requirements
+
+### Requirement: 桌面应用启动
+
+系统 SHALL 支持作为桌面应用启动，将后端服务与前端静态资源打包为单一可执行文件。
+
+#### Scenario: 双击启动
+- **WHEN** 用户双击桌面应用可执行文件
+- **THEN** 系统启动后端服务
+- **AND** 系统托盘图标出现
+- **AND** 浏览器自动打开 `http://localhost:9826` 显示管理界面
+
+#### Scenario: 单实例检查
+- **WHEN** 用户尝试启动第二个实例
+- **THEN** 系统检测到已有实例运行
+- **AND** 显示错误提示"已有 Nex 实例运行"
+- **AND** 新实例退出
+
+### Requirement: 系统托盘
+
+系统 SHALL 提供跨平台系统托盘功能，支持托盘图标和菜单。
+
+#### Scenario: 托盘图标显示
+- **WHEN** 桌面应用启动成功
+- **THEN** 系统托盘区域显示应用图标
+- **AND** 托盘图标 tooltip 显示"AI Gateway"
+
+#### Scenario: 托盘菜单显示
+- **WHEN** 用户点击托盘图标（左键或右键）
+- **THEN** 显示托盘菜单
+- **AND** 菜单包含"打开管理界面"选项
+- **AND** 菜单包含"状态: 运行中"选项（禁用状态）
+- **AND** 菜单包含"端口: 9826"选项（禁用状态）
+- **AND** 菜单包含"关于"选项
+- **AND** 菜单包含"退出"选项
+
+#### Scenario: 打开管理界面
+- **WHEN** 用户点击托盘菜单"打开管理界面"
+- **THEN** 系统在浏览器中打开 `http://localhost:9826`
+
+#### Scenario: 浏览器打开失败
+- **WHEN** 系统无法打开浏览器（浏览器未安装等）
+- **THEN** 托盘菜单仍可正常使用
+- **AND** 用户可手动访问 `http://localhost:9826`
+
+#### Scenario: 退出应用
+- **WHEN** 用户点击托盘菜单"退出"
+- **THEN** 系统优雅关闭后端服务
+- **AND** 托盘图标消失
+- **AND** 应用进程退出
+
+### Requirement: 静态文件服务
+
+系统 SHALL 通过 Gin 同时服务 API 和前端静态资源。
+
+#### Scenario: API 请求路由
+- **WHEN** 请求路径以 `/api/` 或 `/v1/` 开头
+- **THEN** 请求由现有业务 handler 处理
+
+#### Scenario: 静态资源路由
+- **WHEN** 请求路径为 `/assets/*`
+- **THEN** 返回嵌入的前端静态资源文件
+
+#### Scenario: SPA 路由回退
+- **WHEN** 请求路径不匹配任何 API 或静态资源路由
+- **THEN** 返回 `index.html`（支持前端 SPA 路由）
+
+### Requirement: 端口冲突检测
+
+系统 SHALL 在启动前检测端口是否可用。
+
+#### Scenario: 端口可用
+- **WHEN** 端口 9826 未被占用
+- **THEN** 服务正常启动
+
+#### Scenario: 端口被占用
+- **WHEN** 端口 9826 已被其他程序占用
+- **THEN** 显示错误提示"端口 9826 已被占用"
+- **AND** 应用退出
+
+### Requirement: 跨平台构建
+
+系统 SHALL 支持跨平台构建和打包。
+
+#### Scenario: macOS 构建
+- **WHEN** 执行 macOS 构建命令
+- **THEN** 生成 `nex-darwin-arm64` 和 `nex-darwin-amd64` 可执行文件
+- **AND** 可打包为 `.app` bundle
+
+#### Scenario: Windows 构建
+- **WHEN** 执行 Windows 构建命令
+- **THEN** 生成 `nex-windows-amd64.exe` 可执行文件
+- **AND** 运行时不显示控制台窗口
+
+#### Scenario: Linux 构建
+- **WHEN** 执行 Linux 构建命令
+- **THEN** 生成 `nex-linux-amd64` 可执行文件
+
+### Requirement: macOS .app 打包
+
+系统 SHALL 支持打包为 macOS .app bundle。
+
+#### Scenario: .app 结构
+- **WHEN** 执行打包脚本
+- **THEN** 生成 `Nex.app` 目录结构
+- **AND** 包含 `Contents/Info.plist` 元数据
+- **AND** 包含 `Contents/MacOS/nex` 可执行文件
+- **AND** 包含 `Contents/Resources/AppIcon.icns` 图标
+- **AND** `Info.plist` 中 `LSUIElement` 为 `true`（不显示 Dock 图标）
+
+### Requirement: 关于对话框
+
+系统 SHALL 提供关于对话框显示应用信息。
+
+#### Scenario: 显示关于
+- **WHEN** 用户点击托盘菜单"关于"
+- **THEN** 显示对话框包含应用名称、项目链接
--- a/scripts/build/package-macos.sh
+++ b/scripts/build/package-macos.sh
@@ -0,0 +1,68 @@
+#!/bin/bash
+
+VERSION="1.0.0"
+APP_NAME="Nex"
+BUNDLE_ID="io.nex.gateway"
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_ROOT="$(cd "${SCRIPT_DIR}/../.." && pwd)"
+BUILD_DIR="${PROJECT_ROOT}/build"
+ASSETS_DIR="${PROJECT_ROOT}/assets"
+
+echo "打包 macOS .app..."
+
+mkdir -p "${BUILD_DIR}/${APP_NAME}.app/Contents/MacOS"
+mkdir -p "${BUILD_DIR}/${APP_NAME}.app/Contents/Resources"
+
+if [ -f "${BUILD_DIR}/nex-darwin-arm64" ]; then
+    cp "${BUILD_DIR}/nex-darwin-arm64" "${BUILD_DIR}/${APP_NAME}.app/Contents/MacOS/nex"
+elif [ -f "${BUILD_DIR}/nex-darwin-amd64" ]; then
+    cp "${BUILD_DIR}/nex-darwin-amd64" "${BUILD_DIR}/${APP_NAME}.app/Contents/MacOS/nex"
+else
+    echo "错误: 未找到 macOS 二进制文件，请先运行 make desktop-darwin"
+    exit 1
+fi
+
+if [ -f "${ASSETS_DIR}/AppIcon.icns" ]; then
+    cp "${ASSETS_DIR}/AppIcon.icns" "${BUILD_DIR}/${APP_NAME}.app/Contents/Resources/"
+else
+    echo "警告: 未找到 AppIcon.icns"
+fi
+
+cat > "${BUILD_DIR}/${APP_NAME}.app/Contents/Info.plist" << EOF
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>zh_CN</string>
+    <key>CFBundleExecutable</key>
+    <string>nex</string>
+    <key>CFBundleIconFile</key>
+    <string>AppIcon</string>
+    <key>CFBundleIdentifier</key>
+    <string>${BUNDLE_ID}</string>
+    <key>CFBundleInfoDictionaryVersion</key>
+    <string>6.0</string>
+    <key>CFBundleName</key>
+    <string>${APP_NAME} Gateway</string>
+    <key>CFBundleDisplayName</key>
+    <string>${APP_NAME} Gateway</string>
+    <key>CFBundlePackageType</key>
+    <string>APPL</string>
+    <key>CFBundleShortVersionString</key>
+    <string>${VERSION}</string>
+    <key>CFBundleVersion</key>
+    <string>${VERSION}</string>
+    <key>LSMinimumSystemVersion</key>
+    <string>10.13</string>
+    <key>LSUIElement</key>
+    <true/>
+    <key>NSHighResolutionCapable</key>
+    <true/>
+</dict>
+</plist>
+EOF
+
+chmod +x "${BUILD_DIR}/${APP_NAME}.app/Contents/MacOS/nex"
+
+echo "打包完成: ${BUILD_DIR}/${APP_NAME}.app"