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-tauri/src/claude_plugin.rs

@@ -80,7 +80,7 @@ pub fn write_claude_config() -> Result<bool, AppError> {
     if changed || !path.exists() {
         let serialized = serde_json::to_string_pretty(&obj)
             .map_err(|e| AppError::JsonSerialize { source: e })?;
-        fs::write(&path, format!("{}\n", serialized)).map_err(|e| AppError::io(&path, e))?;
+        fs::write(&path, format!("{serialized}\n")).map_err(|e| AppError::io(&path, e))?;
         Ok(true)
     } else {
         Ok(false)
@@ -114,7 +114,7 @@ pub fn clear_claude_config() -> Result<bool, AppError> {
 
     let serialized =
         serde_json::to_string_pretty(&value).map_err(|e| AppError::JsonSerialize { source: e })?;
-    fs::write(&path, format!("{}\n", serialized)).map_err(|e| AppError::io(&path, e))?;
+    fs::write(&path, format!("{serialized}\n")).map_err(|e| AppError::io(&path, e))?;
     Ok(true)
 }