修复 Electron 应用窗口不显示的问题

- 修正 Electron 依赖版本为 28.0.0（解决安装问题）
- 更新 package.json 中的启动脚本，改进并发命令执行
- 修正主进程入口文件路径配置
- 调整 TypeScript 编译配置的根目录设置
- 添加 Windows 开发环境启动脚本 start-dev.bat
- 更新 .gitignore 排除编译产物和锁文件

问题原因：pnpm 默认阻止了 Electron 安装脚本执行，导致应用无法正常启动

package.json

@@ -2,10 +2,12 @@
   "name": "cc-switch",
   "version": "1.0.0",
   "description": "Claude Code 供应商切换工具",
-  "main": "dist/main.js",
+  "main": "dist/main/index.js",
   "scripts": {
-    "dev": "concurrently \"npm run dev:main\" \"npm run dev:renderer\"",
-    "dev:main": "tsc -w -p tsconfig.main.json",
+    "dev": "concurrently -k \"npm:dev:renderer\" \"npm:dev:electron:watch\"",
+    "dev:electron": "tsc -p tsconfig.main.json && electron .",
+    "dev:electron:watch": "tsc -p tsconfig.main.json && concurrently -k \"tsc -w -p tsconfig.main.json\" \"npm:electron\"",
+    "electron": "electron .",
     "dev:renderer": "vite",
     "build": "npm run build:renderer && npm run build:main",
     "build:main": "tsc -p tsconfig.main.json",
@@ -22,7 +24,7 @@
     "@types/react-dom": "^18.2.0",
     "@vitejs/plugin-react": "^4.2.0",
     "concurrently": "^8.2.0",
-    "electron": "^28.0.0",
+    "electron": "28.0.0",
     "electron-builder": "^24.0.0",
     "typescript": "^5.3.0",
     "vite": "^5.0.0"