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/types.ts

@@ -77,6 +77,10 @@ export interface ProviderMeta {
   custom_endpoints?: Record<string, CustomEndpoint>;
   // 用量查询脚本配置
   usage_script?: UsageScript;
+  // 是否为官方合作伙伴
+  isPartner?: boolean;
+  // 合作伙伴促销 key（用于后端识别 PackyCode 等）
+  partnerPromotionKey?: string;
 }
 
 // 应用设置类型（用于设置对话框与 Tauri API）
@@ -97,6 +101,12 @@ export interface Settings {
   customEndpointsClaude?: Record<string, CustomEndpoint>;
   // Codex 自定义端点列表
   customEndpointsCodex?: Record<string, CustomEndpoint>;
+  // 安全设置（兼容未来扩展）
+  security?: {
+    auth?: {
+      selectedType?: string;
+    };
+  };
 }
 
 // MCP 服务器连接参数（宽松：允许扩展字段）