feat: 全平台打包 + CI/CD 自动构建工作流

- 修复移动端: axios替换为原生fetch (React Native兼容)
- 新增 .gitea/workflows/build.yml CI/CD工作流:
  - Windows: NSIS安装包 (windows-latest)
  - macOS: DMG x64+arm64 (macos-latest)
  - Linux: AppImage+deb (ubuntu-latest)
  - Android: APK via expo prebuild + gradle (ubuntu-latest)
  - iOS: simulator build (macos-latest)
  - 移动端JS Bundle导出 (android+ios)
  - 自动创建Release (tag触发)

本地已构建产物:
- client/release/FunConnect-1.1.0-Win-x64.exe (73MB)
- client/release/FunConnect-1.1.0-Linux-x64.zip (99MB)
- mobile JS bundles (android + ios) 已验证导出成功

mobile/package.json

@@ -12,18 +12,17 @@
     "build:all": "eas build --platform all"
   },
   "dependencies": {
+    "@react-native-async-storage/async-storage": "1.21.0",
+    "@react-navigation/bottom-tabs": "^6.5.11",
+    "@react-navigation/native": "^6.1.9",
     "expo": "~50.0.0",
-    "expo-status-bar": "~1.11.1",
     "expo-clipboard": "~5.0.1",
     "expo-constants": "~15.4.5",
+    "expo-status-bar": "~1.11.1",
     "react": "18.2.0",
     "react-native": "0.73.4",
     "react-native-safe-area-context": "4.8.2",
-    "react-native-screens": "~3.29.0",
-    "@react-navigation/native": "^6.1.9",
-    "@react-navigation/bottom-tabs": "^6.5.11",
-    "@react-native-async-storage/async-storage": "1.21.0",
-    "axios": "^1.6.2"
+    "react-native-screens": "~3.29.0"
   },
   "devDependencies": {
     "@babel/core": "^7.20.0",