fix: 完善桌面应用图标打包

统一 macOS 图标命名为 icon.icns。\n补充 Linux hicolor 图标资源。\n修复 Windows make 构建兼容性并为 exe 嵌入图标资源。\n清理旧版图标说明与不再使用的 SVG 源文件。

Makefile

@@ -6,7 +6,7 @@
 	frontend-build frontend-dev frontend-test frontend-test-watch frontend-test-coverage frontend-test-e2e frontend-lint frontend-clean \
 	desktop-build desktop-build-mac desktop-build-win desktop-build-linux \
 	desktop-dev desktop-test desktop-clean \
-	desktop-prepare-frontend desktop-prepare-embedfs
+	desktop-prepare-frontend desktop-prepare-embedfs desktop-prepare-windows-resource
 
 # ============================================
 # 顶层便捷命令
@@ -158,15 +158,40 @@ desktop-build: desktop-build-mac desktop-build-win desktop-build-linux
 
 desktop-prepare-frontend:
 	@echo "📦 Preparing frontend for desktop..."
+ifeq ($(OS),Windows_NT)
+	powershell -NoProfile -Command "Copy-Item -LiteralPath 'frontend/.env.desktop' -Destination 'frontend/.env.production.local' -Force"
+	cd frontend && bun install && bun run build
+	powershell -NoProfile -Command "Remove-Item -LiteralPath 'frontend/.env.production.local' -Force -ErrorAction SilentlyContinue"
+else
 	cd frontend && cp .env.desktop .env.production.local
 	cd frontend && bun install && bun run build
 	rm -f frontend/.env.production.local
+endif
 
 desktop-prepare-embedfs:
 	@echo "📦 Preparing embedded filesystem..."
+ifeq ($(OS),Windows_NT)
+	powershell -NoProfile -Command "Remove-Item -LiteralPath 'embedfs/assets' -Recurse -Force -ErrorAction SilentlyContinue; Remove-Item -LiteralPath 'embedfs/frontend-dist' -Recurse -Force -ErrorAction SilentlyContinue; Copy-Item -LiteralPath 'assets' -Destination 'embedfs/assets' -Recurse; Copy-Item -LiteralPath 'frontend/dist' -Destination 'embedfs/frontend-dist' -Recurse"
+else
 	rm -rf embedfs/assets embedfs/frontend-dist
 	cp -r assets embedfs/assets
 	cp -r frontend/dist embedfs/frontend-dist
+endif
+
+desktop-prepare-windows-resource:
+	@echo "📦 Preparing Windows executable icon..."
+ifeq ($(OS),Windows_NT)
+	cd backend/cmd/desktop && windres -O coff -F pe-x86-64 -i icon_windows.rc -o rsrc_windows_amd64.syso
+else
+	@if command -v x86_64-w64-mingw32-windres >/dev/null 2>&1; then \
+		cd backend/cmd/desktop && x86_64-w64-mingw32-windres -O coff -F pe-x86-64 -i icon_windows.rc -o rsrc_windows_amd64.syso; \
+	elif command -v windres >/dev/null 2>&1; then \
+		cd backend/cmd/desktop && windres -O coff -F pe-x86-64 -i icon_windows.rc -o rsrc_windows_amd64.syso; \
+	else \
+		echo "❌ 未找到 windres，无法生成 Windows exe 图标资源"; \
+		exit 1; \
+	fi
+endif
 
 desktop-build-mac: desktop-prepare-frontend desktop-prepare-embedfs
 	@echo "🍎 Building macOS..."
@@ -176,10 +201,10 @@ desktop-build-mac: desktop-prepare-frontend desktop-prepare-embedfs
 	@echo "📦 Packaging macOS .app..."
 	mkdir -p build/Nex.app/Contents/MacOS build/Nex.app/Contents/Resources
 	cp build/nex-mac-universal build/Nex.app/Contents/MacOS/nex
-	@if [ -f assets/AppIcon.icns ]; then \
-		cp assets/AppIcon.icns build/Nex.app/Contents/Resources/; \
+	@if [ -f assets/icon.icns ]; then \
+		cp assets/icon.icns build/Nex.app/Contents/Resources/; \
 	else \
-		echo "⚠️  未找到 assets/AppIcon.icns"; \
+		echo "⚠️  未找到 assets/icon.icns"; \
 	fi
 	@MIN_MACOS_VERSION=$$(vtool -show-build build/nex-mac-universal | awk '/minos / {print $$2; exit}'); \
 	if [ -z "$$MIN_MACOS_VERSION" ]; then \
@@ -196,7 +221,7 @@ desktop-build-mac: desktop-prepare-frontend desktop-prepare-embedfs
 			'    <key>CFBundleExecutable</key>' \
 			'    <string>nex</string>' \
 			'    <key>CFBundleIconFile</key>' \
-			'    <string>AppIcon</string>' \
+			'    <string>icon</string>' \
 			'    <key>CFBundleIdentifier</key>' \
 			'    <string>com.lanyuanxiaoyao.nex</string>' \
 			'    <key>CFBundleInfoDictionaryVersion</key>' \
@@ -227,9 +252,15 @@ desktop-build-mac: desktop-prepare-frontend desktop-prepare-embedfs
 	chmod +x build/Nex.app/Contents/MacOS/nex
 	@echo "✅ macOS app packaged: build/Nex.app"
 
-desktop-build-win: desktop-prepare-frontend desktop-prepare-embedfs
+desktop-build-win: desktop-prepare-frontend desktop-prepare-embedfs desktop-prepare-windows-resource
 	@echo "🪟 Building Windows..."
+ifeq ($(OS),Windows_NT)
+	powershell -NoProfile -Command "New-Item -ItemType Directory -Path 'build' -Force | Out-Null"
+	cd backend && set "CGO_ENABLED=1"&& set "GOOS=windows"&& set "GOARCH=amd64"&& go build -ldflags "-H=windowsgui" -o ../build/nex-win-amd64.exe ./cmd/desktop
+else
+	mkdir -p build
 	cd backend && CGO_ENABLED=1 GOOS=windows GOARCH=amd64 go build -ldflags "-H=windowsgui" -o ../build/nex-win-amd64.exe ./cmd/desktop
+endif
 
 desktop-build-linux: desktop-prepare-frontend desktop-prepare-embedfs
 	@echo "🐧 Building Linux..."