♻️ 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/i18n/locales/zh.ts

@@ -0,0 +1,95 @@
+import { Translation } from '../types';
+
+export const zh: Translation = {
+  // Common
+  settings: '设置',
+  appearance: '外观',
+  searchEngines: '搜索引擎',
+
+  // Theme Settings
+  themeColor: '主题颜色',
+  showSeconds: '显示秒数',
+  use24HourFormat: '24小时制',
+  maskBlurEffect: '遮罩层毛玻璃',
+  searchHistory: '搜索历史记录',
+  backgroundBlur: '背景模糊度',
+  searchBoxOpacity: '搜索框不透明度',
+
+  // Wallpaper Settings
+  wallpaperSettings: '壁纸设置',
+  uploadImageVideo: '上传图片/视频',
+  enterImageVideoUrl: '输入图片或视频链接...',
+  apply: '应用',
+  cover: '填充',
+  contain: '适应',
+  fill: '拉伸',
+  repeat: '平铺',
+  center: '居中',
+  deleteWallpaper: '删除壁纸',
+
+  // Search Engine Manager
+  addCustomEngine: '添加自定义引擎',
+  editSearchEngine: '编辑搜索引擎',
+  name: '名称',
+  searchUrl: '搜索 URL (使用 %s 或直接结尾)',
+  svgIconCode: 'SVG 图标代码',
+  optional: '可选',
+  preview: '预览',
+  cancel: '取消',
+  save: '保存',
+  add: '添加',
+  current: '当前使用',
+  setDefault: '设为默认',
+  edit: '编辑',
+  delete: '删除',
+
+  // Search Box
+  search: 'Search',
+  searchOn: 'Search on',
+  recentSearches: '最近搜索',
+  clearHistory: '清空历史记录',
+
+  // Context Menu
+  copy: '复制',
+  cut: '剪切',
+  paste: '粘贴',
+
+  // Error Boundary
+  somethingWentWrong: '出错了',
+  errorMessage: '应用遇到了一个意外错误。请尝试刷新页面或重置应用。',
+  retry: '重试',
+  refreshPage: '刷新页面',
+
+  // Toast Messages
+  searchEngineDeleted: '搜索引擎已删除',
+  searchEngineUpdated: '搜索引擎更新成功',
+  newSearchEngineAdded: '新搜索引擎已添加',
+  duplicateEngineName: '该搜索引擎名称已存在，请使用其他名称',
+  customWallpaperApplied: '自定义壁纸已应用',
+  wallpaperUploaded: '壁纸上传并应用成功',
+  wallpaperDeleted: '自定义壁纸已删除',
+  fileSizeExceeded: '文件大小不能超过 3.5MB。建议使用URL方式添加。',
+  unsupportedFileType: '不支持的文件类型。仅支持：JPEG, PNG, GIF, WebP, SVG, MP4, WebM, OGG',
+  fileContentMismatch: '文件内容与类型不匹配',
+  storageFull: '存储空间不足！文件过大，无法保存。建议使用 URL 方式。',
+  invalidUrlFormat: '无效的 URL 格式',
+  unsupportedProtocol: '仅支持 HTTP 或 HTTPS 协议的链接',
+  invalidSearchUrl: '生成的搜索 URL 无效',
+  copyFailed: '复制失败',
+  cutFailed: '剪切失败',
+  cannotReadClipboard: '无法读取剪贴板',
+
+  // Clock
+  monday: '星期一',
+  tuesday: '星期二',
+  wednesday: '星期三',
+  thursday: '星期四',
+  friday: '星期五',
+  saturday: '星期六',
+  sunday: '星期日',
+
+  // Language
+  language: '语言',
+  english: 'English',
+  chinese: '简体中文',
+};