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/config.rs

@@ -33,7 +33,7 @@ fn derive_mcp_path_from_override(dir: &Path) -> Option<PathBuf> {
         return None;
     }
     let parent = dir.parent().unwrap_or_else(|| Path::new(""));
-    Some(parent.join(format!("{}.json", file_name)))
+    Some(parent.join(format!("{file_name}.json")))
 }
 
 /// 获取 Claude MCP 配置文件路径，若设置了目录覆盖则与覆盖目录同级
@@ -95,7 +95,7 @@ pub fn get_provider_config_path(provider_id: &str, provider_name: Option<&str>)
         .map(sanitize_provider_name)
         .unwrap_or_else(|| sanitize_provider_name(provider_id));
 
-    get_claude_config_dir().join(format!("settings-{}.json", base_name))
+    get_claude_config_dir().join(format!("settings-{base_name}.json"))
 }
 
 /// 读取 JSON 配置文件
@@ -149,7 +149,7 @@ pub fn atomic_write(path: &Path, data: &[u8]) -> Result<(), AppError> {
         .duration_since(std::time::UNIX_EPOCH)
         .unwrap_or_default()
         .as_nanos();
-    tmp.push(format!("{}.tmp.{}", file_name, ts));
+    tmp.push(format!("{file_name}.tmp.{ts}"));
 
     {
         let mut f = fs::File::create(&tmp).map_err(|e| AppError::io(&tmp, e))?;