feat(auth): 接入 Google 登录

- 登录页保留邮箱与 Google 两个入口，Google 按钮按官方规范改为白底四色图标
- 新增 GoogleAuthService：封装 initialize/authenticate，失败以结果对象返回
- AuthApi 增加 googleLogin，AuthController 增加 signInWithGoogle
- iOS 补充 CFBundleURLTypes 与 GIDClientID，Bundle ID 统一为 com.stormg.lumadrama
- Google 请求期间按钮显示转圈并禁止重复点击

lib/l10n/app_en.arb

@@ -32,6 +32,7 @@
   "authContinueGoogle": "Continue with Google",
   "authPhoneSignIn": "Phone sign in",
   "authEmailSignIn": "Email sign in",
+  "authGoogleFailed": "Google sign in failed, please try again",
   "suspense": "Suspense",
   "romance": "Romance",
   "actionGenre": "Action",