feat: TypeScript + Electron v2 重构 - 纯桌面版

- 全面迁移到 TypeScript，严格类型定义
- 放弃 Web 版，专注 Electron 桌面应用
- 主进程模块化：main.ts, preload.ts, menu.ts, tray.ts, ipc.ts, utils.ts
- 渲染进程完整迁移所有功能组件
- 删除 PWA 相关文件 (sw.js, manifest.json)
- 删除 Web 版降级逻辑
- 保留所有核心功能：流式对话、多模型、Think推理、多模态、RAG知识库、Agent预设、历史管理
- 保留 Windows 11 Fluent Design 暗色主题样式

src/renderer/types.d.ts

@@ -0,0 +1,250 @@
+// ── Ollama API 类型 ──
+
+export interface OllamaMessage {
+  role: 'user' | 'assistant' | 'system';
+  content: string;
+  images?: string[];
+  thinking?: string;
+  reasoning_content?: string;
+}
+
+export interface OllamaChatParams {
+  model: string;
+  messages: OllamaMessage[];
+  stream?: boolean;
+  think?: boolean;
+  system?: string;
+  keep_alive?: number | string;
+  options?: {
+    num_ctx?: number;
+    temperature?: number;
+    [key: string]: unknown;
+  };
+}
+
+export interface OllamaStreamChunk {
+  model?: string;
+  message?: {
+    role: string;
+    content?: string;
+    thinking?: string;
+    reasoning_content?: string;
+  };
+  done?: boolean;
+  eval_count?: number;
+  total_duration?: number;
+}
+
+export interface OllamaModelInfo {
+  name: string;
+  size?: number;
+  digest?: string;
+  modified_at?: string;
+}
+
+export interface OllamaModelDetail {
+  capabilities?: string[];
+  [key: string]: unknown;
+}
+
+export interface OllamaVersionResponse {
+  version: string;
+}
+
+export interface OllamaModelsResponse {
+  models: OllamaModelInfo[];
+}
+
+export interface OllamaPsResponse {
+  models?: Array<{
+    name: string;
+    size_vram?: number;
+    [key: string]: unknown;
+  }>;
+}
+
+export interface OllamaEmbedResponse {
+  embedding?: number[];
+  embeddings?: number[][];
+}
+
+// ── 会话类型 ──
+
+export interface ChatFile {
+  name: string;
+  language?: string;
+  size?: number;
+}
+
+export interface FileContent {
+  language: string;
+  content: string;
+}
+
+export interface RagSource {
+  filename: string;
+  score: number;
+  text: string;
+}
+
+export interface ChatMessage {
+  role: 'user' | 'assistant';
+  content: string;
+  timestamp: number;
+  model?: string;
+  think?: string;
+  eval_count?: number;
+  total_duration?: number;
+  images?: string[];
+  files?: ChatFile[];
+  _fileContents?: FileContent[];
+  ragSources?: RagSource[];
+  stopped?: boolean;
+}
+
+export interface ChatSession {
+  id: string;
+  title: string;
+  model: string;
+  messages: ChatMessage[];
+  createdAt: number;
+  updatedAt: number;
+}
+
+// ── 预设类型 ──
+
+export interface Preset {
+  id: string;
+  name: string;
+  icon: string;
+  systemPrompt: string;
+  temperature: number;
+  numCtx: number;
+  think: boolean;
+  builtIn?: boolean;
+  createdAt: number;
+  updatedAt: number;
+}
+
+// ── 知识库类型 ──
+
+export interface VectorCollection {
+  id: string;
+  name: string;
+  embeddingModel: string;
+  docCount: number;
+  chunkCount: number;
+  createdAt: number;
+  updatedAt: number;
+}
+
+export interface VectorItem {
+  id: string;
+  collectionId: string;
+  docId: string;
+  filename: string;
+  chunkIndex: number;
+  text: string;
+  charCount: number;
+  embedding: number[];
+}
+
+export interface SearchResult extends VectorItem {
+  score: number;
+}
+
+export interface DocInfo {
+  docId: string;
+  filename: string;
+  chunkCount: number;
+}
+
+// ── 桌面 Bridge 类型 ──
+
+export interface MetonaDesktopAPI {
+  isDesktop: boolean;
+  info: () => Promise<AppInfo>;
+  dialog: {
+    openFile: (options?: FileFilterOptions) => Promise<string[] | null>;
+    saveFile: (options?: SaveFileOptions) => Promise<string | null>;
+  };
+  fs: {
+    readFile: (filePath: string) => Promise<{ success: boolean; content?: string; name?: string; error?: string }>;
+    writeFile: (filePath: string, content: string) => Promise<{ success: boolean; error?: string }>;
+  };
+  notify: (title: string, body: string) => void;
+  window: {
+    minimize: () => void;
+    maximize: () => void;
+    close: () => void;
+  };
+  openExternal: (url: string) => void;
+  onMenuAction: (callback: (action: string) => void) => void;
+  onTrayAction: (callback: (action: string) => void) => void;
+  removeAllListeners: (channel: string) => void;
+}
+
+export interface AppInfo {
+  version: string;
+  platform: string;
+  arch: string;
+  electronVersion: string;
+  userDataPath: string;
+}
+
+export interface FileFilterOptions {
+  filters?: Array<{ name: string; extensions: string[] }>;
+}
+
+export interface SaveFileOptions {
+  defaultPath?: string;
+  filters?: Array<{ name: string; extensions: string[] }>;
+}
+
+// ── 桌面 Bridge 接口 ──
+
+export interface DesktopBridge {
+  isDesktop: boolean;
+  getInfo: () => Promise<{ platform: string; version: string; arch?: string; electronVersion?: string; userDataPath?: string }>;
+  openFile: (filters?: Array<{ name: string; extensions: string[] }>) => Promise<string[] | null>;
+  saveFile: (options?: SaveFileOptions) => Promise<string | null>;
+  readFile: (filePath: string) => Promise<{ success: boolean; content?: string; name?: string; error?: string }>;
+  writeFile: (filePath: string, content: string) => Promise<{ success: boolean; error?: string }>;
+  notify: (title: string, body: string) => void;
+  minimize: () => void;
+  maximize: () => void;
+  close: () => void;
+  openExternal: (url: string) => void;
+  onMenuAction: (callback: (action: string) => void) => void;
+  onTrayAction: (callback: (action: string) => void) => void;
+  off: (channel: string) => void;
+}
+
+// ── State Keys ──
+
+export type StateKey =
+  | 'db'
+  | 'api'
+  | 'currentSession'
+  | 'isStreaming'
+  | 'isHistoryView'
+  | 'pendingImages'
+  | 'abortController'
+  | 'systemPrompt'
+  | 'systemPromptEnabled'
+  | 'numCtx'
+  | 'historyPage'
+  | 'historySearchQuery'
+  | 'temperature'
+  | 'thinkEnabled'
+  | 'presets'
+  | 'activePresetId';
+
+// ── Window global 声明 ──
+
+declare global {
+  interface Window {
+    metonaDesktop?: MetonaDesktopAPI;
+    __metonaBridge?: DesktopBridge;
+  }
+}