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

backend/go.sum

@@ -163,6 +163,20 @@ github.com/fzipp/gocyclo v0.6.0 h1:lsblElZG7d3ALtGMx9fmxeTKZaLLpU8mET09yN4BBLo=
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@@ -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=
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@@ -397,6 +412,8 @@ github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
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@@ -460,6 +477,8 @@ github.com/otiai10/curr v0.0.0-20150429015615-9b4961190c95/go.mod h1:9qAhocn7zKJ
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 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
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@@ -819,6 +839,7 @@ golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -832,6 +853,7 @@ golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBc
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@@ -1008,6 +1030,7 @@ google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp0
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