♻️ refactor: reorganize project structure and centralize search engine config

- Move all source files from root to src/ directory for better organization
- Create src/config/searchEngines.ts to centralize search engine configurations
  - Define unified SearchEngineConfig interface
  - Support both JSONP and Fetch request methods
  - Implement response parsers for Google, Baidu, Bing, DuckDuckGo, and Bilibili
- Refactor src/utils/suggestions.ts to use centralized config
  - Simplify code from 126 lines to 81 lines
  - Support hybrid JSONP/Fetch mode (Bilibili uses Fetch via Vite proxy)
  - Remove duplicate URL construction and parsing logic
- Update path alias configuration
  - Change @/* from ./* to ./src/* in tsconfig.json
  - Update vite.config.ts alias to point to ./src
- Add Bilibili proxy configuration in vite.config.ts for development
- Remove Bilibili rewrites from vercel.json (use Vite proxy instead)
- Add @vercel/node to devDependencies
- Remove unused files: README.md, i18n/README.md, metadata.json, vite-env.d.ts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/types.ts

@@ -0,0 +1,40 @@
+
+
+export interface SearchEngine {
+  name: string;
+  urlPattern: string;
+  icon?: string;
+}
+
+export type BackgroundType = 'image' | 'video';
+
+export type WallpaperFit = 'cover' | 'contain' | 'fill' | 'repeat' | 'center';
+
+export interface PresetWallpaper {
+  id?: string;
+  name: string;
+  type: BackgroundType;
+  url: string;
+  thumbnail?: string;
+  isCustom?: boolean;
+}
+
+export type Language = 'en' | 'zh';
+
+export interface UserSettings {
+  use24HourFormat: boolean;
+  showSeconds: boolean;
+  backgroundBlur: number;
+  searchEngines: SearchEngine[];
+  selectedEngine: string;
+  themeColor: string;
+  searchOpacity: number;
+  enableMaskBlur: boolean;
+  backgroundUrl: string;
+  backgroundType: BackgroundType;
+  wallpaperFit: WallpaperFit;
+  customWallpapers: PresetWallpaper[];
+  enableSearchHistory: boolean;
+  searchHistory: string[];
+  language: Language;
+}