feat: 完成 Web2App 核心功能实现

- Electron 主进程：窗口管理、IPC、项目读写、打包引擎
- Vue 3 前端：4 个视图页面、3 个组件、Pinia 状态管理
- 生成应用模板：Express 后端 + Electron 窗口
- 支持资源导入、应用配置、跨平台打包

package.json

@@ -0,0 +1,64 @@
+{
+  "name": "web2app",
+  "version": "1.0.0",
+  "description": "将网站转化为独立运行的桌面应用",
+  "main": "electron/main.js",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "electron:dev": "concurrently \"vite\" \"wait-on http://localhost:5173 && electron .\"",
+    "electron:build": "vite build && electron-builder --config",
+    "preview": "vite preview"
+  },
+  "build": {
+    "appId": "com.web2app.app",
+    "productName": "Web2App",
+    "directories": {
+      "output": "release"
+    },
+    "files": [
+      "electron/**/*",
+      "dist/**/*",
+      "template/**/*",
+      "package.json"
+    ],
+    "extraResources": [],
+    "win": {
+      "target": [
+        {
+          "target": "nsis",
+          "arch": ["x64"]
+        }
+      ],
+      "icon": null
+    },
+    "nsis": {
+      "oneClick": false,
+      "perMachine": false,
+      "allowToChangeInstallationDirectory": true,
+      "createDesktopShortcut": true,
+      "shortcutName": "Web2App"
+    },
+    "mac": {
+      "target": ["dmg"],
+      "icon": null
+    },
+    "linux": {
+      "target": ["AppImage"],
+      "icon": null
+    }
+  },
+  "dependencies": {
+    "pinia": "^2.1.0",
+    "vue": "^3.4.0",
+    "vue-router": "^4.3.0"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-vue": "^5.0.0",
+    "concurrently": "^8.2.0",
+    "electron": "^28.0.0",
+    "electron-builder": "^24.9.0",
+    "vite": "^5.4.0",
+    "wait-on": "^7.2.0"
+  }
+}