feat(gemini): add Gemini provider integration (#202)

* feat(gemini): add Gemini provider integration

- Add gemini_config.rs module for .env file parsing
- Extend AppType enum to support Gemini
- Implement GeminiConfigEditor and GeminiFormFields components
- Add GeminiIcon with standardized 1024x1024 viewBox
- Add Gemini provider presets configuration
- Update i18n translations for Gemini support
- Extend ProviderService and McpService for Gemini

* fix(gemini): resolve TypeScript errors, add i18n support, and fix MCP logic

**Critical Fixes:**
- Fix TS2741 errors in tests/msw/state.ts by adding missing Gemini type definitions
- Fix ProviderCard.extractApiUrl to support GOOGLE_GEMINI_BASE_URL display
- Add missing apps.gemini i18n keys (zh/en) for proper app name display
- Fix MCP service Gemini cross-app duplication logic to prevent self-copy

**Technical Details:**
- tests/msw/state.ts: Add gemini default providers, current ID, and MCP config
- ProviderCard.tsx: Check both ANTHROPIC_BASE_URL and GOOGLE_GEMINI_BASE_URL
- services/mcp.rs: Skip Gemini in sync_other_side logic with unreachable!() guards
- Run pnpm format to auto-fix code style issues

**Verification:**
- ✅ pnpm typecheck passes
- ✅ pnpm format completed

* feat(gemini): enhance authentication and config parsing

- Add strict and lenient .env parsing modes
- Implement PackyCode partner authentication detection
- Support Google OAuth official authentication
- Auto-configure security.auth.selectedType for PackyCode
- Add comprehensive test coverage for all auth types
- Update i18n for OAuth hints and Gemini config

---------

Co-authored-by: Jason <farion1231@gmail.com>

src/i18n/locales/zh.json

@@ -67,6 +67,7 @@
     "addNewProvider": "添加新供应商",
     "addClaudeProvider": "添加 Claude Code 供应商",
     "addCodexProvider": "添加 Codex 供应商",
+    "addGeminiProvider": "添加 Gemini 供应商",
     "addProviderHint": "填写信息后即可在列表中快速切换供应商。",
     "editClaudeProvider": "编辑 Claude Code 供应商",
     "editCodexProvider": "编辑 Codex 供应商",
@@ -91,7 +92,17 @@
     "addProvider": "添加供应商",
     "sortUpdated": "排序已更新",
     "usageSaved": "用量查询配置已保存",
-    "usageSaveFailed": "用量查询配置保存失败"
+    "usageSaveFailed": "用量查询配置保存失败",
+    "geminiConfig": "Gemini 配置",
+    "geminiConfigHint": "使用 .env 格式配置 Gemini",
+    "form": {
+      "gemini": {
+        "model": "模型",
+        "oauthTitle": "OAuth 认证模式",
+        "oauthHint": "Google 官方使用 OAuth 个人认证，无需填写 API Key。首次使用时会自动打开浏览器进行登录。",
+        "apiKeyPlaceholder": "请输入 Gemini API Key"
+      }
+    }
   },
   "notifications": {
     "providerAdded": "供应商已添加",
@@ -195,7 +206,8 @@
   },
   "apps": {
     "claude": "Claude Code",
-    "codex": "Codex"
+    "codex": "Codex",
+    "gemini": "Gemini"
   },
   "console": {
     "providerSwitchReceived": "收到供应商切换事件:",