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/config/geminiProviderPresets.ts

@@ -0,0 +1,83 @@
+import type { ProviderCategory } from "@/types";
+
+export interface GeminiProviderPreset {
+  name: string;
+  websiteUrl: string;
+  apiKeyUrl?: string;
+  settingsConfig: object;
+  baseURL?: string;
+  model?: string;
+  description?: string;
+  category?: ProviderCategory;
+  isPartner?: boolean;
+  partnerPromotionKey?: string;
+  endpointCandidates?: string[];
+}
+
+export const geminiProviderPresets: GeminiProviderPreset[] = [
+  {
+    name: "Google",
+    websiteUrl: "https://ai.google.dev/",
+    apiKeyUrl: "https://aistudio.google.com/apikey",
+    settingsConfig: {
+      env: {
+        GEMINI_MODEL: "gemini-2.5-pro",
+      },
+    },
+    description: "Google 官方 Gemini API (OAuth)",
+    category: "official",
+    partnerPromotionKey: "google-official",
+    model: "gemini-2.5-pro",
+  },
+  {
+    name: "PackyCode",
+    websiteUrl: "https://www.packyapi.com",
+    apiKeyUrl: "https://www.packyapi.com/register?aff=cc-switch",
+    settingsConfig: {
+      env: {
+        GOOGLE_GEMINI_BASE_URL: "https://www.packyapi.com",
+        GEMINI_MODEL: "gemini-2.5-pro",
+      },
+    },
+    baseURL: "https://www.packyapi.com",
+    model: "gemini-2.5-pro",
+    description: "PackyCode",
+    category: "third_party",
+    isPartner: true,
+    partnerPromotionKey: "packycode",
+    endpointCandidates: [
+      "https://api-slb.packyapi.com",
+      "https://www.packyapi.com",
+    ],
+  },
+  {
+    name: "自定义",
+    websiteUrl: "",
+    settingsConfig: {
+      env: {
+        GOOGLE_GEMINI_BASE_URL: "",
+        GEMINI_MODEL: "gemini-2.5-pro",
+      },
+    },
+    model: "gemini-2.5-pro",
+    description: "自定义 Gemini API 端点",
+    category: "custom",
+  },
+];
+
+export function getGeminiPresetByName(
+  name: string,
+): GeminiProviderPreset | undefined {
+  return geminiProviderPresets.find((preset) => preset.name === name);
+}
+
+export function getGeminiPresetByUrl(
+  url: string,
+): GeminiProviderPreset | undefined {
+  if (!url) return undefined;
+  return geminiProviderPresets.find(
+    (preset) =>
+      preset.baseURL &&
+      url.toLowerCase().includes(preset.baseURL.toLowerCase()),
+  );
+}