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/settings.rs

@@ -16,6 +16,20 @@ pub struct CustomEndpoint {
     pub last_used: Option<i64>,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct SecurityAuthSettings {
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub selected_type: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct SecuritySettings {
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub auth: Option<SecurityAuthSettings>,
+}
+
 /// 应用设置结构，允许覆盖默认配置目录
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
@@ -32,7 +46,11 @@ pub struct AppSettings {
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub codex_config_dir: Option<String>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub gemini_config_dir: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub language: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub security: Option<SecuritySettings>,
     /// Claude 自定义端点列表
     #[serde(default, skip_serializing_if = "HashMap::is_empty")]
     pub custom_endpoints_claude: HashMap<String, CustomEndpoint>,
@@ -57,7 +75,9 @@ impl Default for AppSettings {
             enable_claude_plugin_integration: false,
             claude_config_dir: None,
             codex_config_dir: None,
+            gemini_config_dir: None,
             language: None,
+            security: None,
             custom_endpoints_claude: HashMap::new(),
             custom_endpoints_codex: HashMap::new(),
         }
@@ -89,6 +109,13 @@ impl AppSettings {
             .filter(|s| !s.is_empty())
             .map(|s| s.to_string());
 
+        self.gemini_config_dir = self
+            .gemini_config_dir
+            .as_ref()
+            .map(|s| s.trim())
+            .filter(|s| !s.is_empty())
+            .map(|s| s.to_string());
+
         self.language = self
             .language
             .as_ref()
@@ -171,6 +198,27 @@ pub fn update_settings(mut new_settings: AppSettings) -> Result<(), AppError> {
     Ok(())
 }
 
+pub fn ensure_security_auth_selected_type(selected_type: &str) -> Result<(), AppError> {
+    let mut settings = get_settings();
+    let current = settings
+        .security
+        .as_ref()
+        .and_then(|sec| sec.auth.as_ref())
+        .and_then(|auth| auth.selected_type.as_deref());
+
+    if current == Some(selected_type) {
+        return Ok(());
+    }
+
+    let mut security = settings.security.unwrap_or_default();
+    let mut auth = security.auth.unwrap_or_default();
+    auth.selected_type = Some(selected_type.to_string());
+    security.auth = Some(auth);
+    settings.security = Some(security);
+
+    update_settings(settings)
+}
+
 pub fn get_claude_override_dir() -> Option<PathBuf> {
     let settings = settings_store().read().ok()?;
     settings
@@ -186,3 +234,11 @@ pub fn get_codex_override_dir() -> Option<PathBuf> {
         .as_ref()
         .map(|p| resolve_override_path(p))
 }
+
+pub fn get_gemini_override_dir() -> Option<PathBuf> {
+    let settings = settings_store().read().ok()?;
+    settings
+        .gemini_config_dir
+        .as_ref()
+        .map(|p| resolve_override_path(p))
+}