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/main/main.ts

@@ -0,0 +1,159 @@
+/**
+ * Metona Ollama Desktop - 主进程入口
+ */
+
+import { app, BrowserWindow } from 'electron';
+import * as path from 'path';
+import * as fs from 'fs';
+import { setupIPC } from './ipc.js';
+import { createTray } from './tray.js';
+import { createMenu } from './menu.js';
+import { showNotification } from './utils.js';
+
+const APP_NAME = 'Metona Ollama';
+const ICON_PATH = path.join(__dirname, '..', '..', 'assets', 'icons', 'llama.png');
+const ICO_PATH = path.join(__dirname, '..', '..', 'assets', 'icons', 'llama.ico');
+const IS_DEV = !app.isPackaged;
+
+export let mainWindow: BrowserWindow | null = null;
+export let isQuitting = false;
+
+export function getIconPath(): string {
+  return process.platform === 'win32' ? ICO_PATH : ICON_PATH;
+}
+
+function createMainWindow(): BrowserWindow {
+  const userDataPath = app.getPath('userData');
+  const configPath = path.join(userDataPath, 'window-state.json');
+  let windowState = { width: 1200, height: 800, x: undefined as number | undefined, y: undefined as number | undefined, maximized: false };
+
+  try {
+    if (fs.existsSync(configPath)) {
+      windowState = JSON.parse(fs.readFileSync(configPath, 'utf-8'));
+    }
+  } catch { /* use defaults */ }
+
+  mainWindow = new BrowserWindow({
+    width: windowState.width || 1200,
+    height: windowState.height || 800,
+    x: windowState.x,
+    y: windowState.y,
+    minWidth: 800,
+    minHeight: 600,
+    icon: process.platform === 'win32' ? ICO_PATH : ICON_PATH,
+    title: APP_NAME,
+    backgroundColor: '#202020',
+    show: false,
+    autoHideMenuBar: true,
+    menuBarVisible: false,
+    webPreferences: {
+      preload: path.join(__dirname, 'preload.js'),
+      contextIsolation: true,
+      nodeIntegration: false,
+      sandbox: false,
+      webSecurity: false,
+      allowRunningInsecureContent: false
+    }
+  });
+
+  mainWindow.loadFile(path.join(__dirname, '..', '..', 'index.html'));
+  mainWindow.setMenuBarVisibility(false);
+
+  mainWindow.once('ready-to-show', () => {
+    if (windowState.maximized) {
+      mainWindow!.maximize();
+    }
+    mainWindow!.show();
+  });
+
+  const saveWindowState = (): void => {
+    if (!mainWindow || mainWindow.isMaximized() || mainWindow.isMinimized()) return;
+    const bounds = mainWindow.getBounds();
+    try {
+      fs.writeFileSync(configPath, JSON.stringify(bounds));
+    } catch { /* ignore */ }
+  };
+
+  mainWindow.on('resize', saveWindowState);
+  mainWindow.on('move', saveWindowState);
+
+  mainWindow.on('maximize', () => {
+    try {
+      const state = JSON.parse(fs.readFileSync(configPath, 'utf-8'));
+      state.maximized = true;
+      fs.writeFileSync(configPath, JSON.stringify(state));
+    } catch { /* ignore */ }
+  });
+
+  mainWindow.on('unmaximize', () => {
+    try {
+      const state = JSON.parse(fs.readFileSync(configPath, 'utf-8'));
+      state.maximized = false;
+      fs.writeFileSync(configPath, JSON.stringify(state));
+    } catch { /* ignore */ }
+  });
+
+  mainWindow.on('close', (e) => {
+    if (!isQuitting) {
+      e.preventDefault();
+      mainWindow!.hide();
+      if (!(global as Record<string, unknown>)._trayHintShown) {
+        (global as Record<string, unknown>)._trayHintShown = true;
+        showNotification('Metona 已最小化到系统托盘', '点击托盘图标可重新打开');
+      }
+    }
+  });
+
+  mainWindow.on('closed', () => {
+    mainWindow = null;
+  });
+
+  mainWindow.webContents.setWindowOpenHandler(({ url }) => {
+    if (url.startsWith('http://') || url.startsWith('https://')) {
+      const { shell } = require('electron');
+      shell.openExternal(url);
+      return { action: 'deny' as const };
+    }
+    return { action: 'allow' as const };
+  });
+
+  return mainWindow;
+}
+
+// ── 单实例锁 ──
+const gotTheLock = app.requestSingleInstanceLock();
+if (!gotTheLock) {
+  app.quit();
+} else {
+  app.on('second-instance', () => {
+    if (mainWindow) {
+      if (mainWindow.isMinimized()) mainWindow.restore();
+      mainWindow.focus();
+    }
+  });
+}
+
+app.whenReady().then(() => {
+  setupIPC();
+  createMainWindow();
+  createTray();
+  createMenu();
+
+  app.on('activate', () => {
+    if (BrowserWindow.getAllWindows().length === 0) {
+      createMainWindow();
+    } else if (mainWindow) {
+      mainWindow.show();
+    }
+  });
+});
+
+app.on('window-all-closed', () => {
+  if (process.platform !== 'darwin') {
+    // keep running with tray
+  }
+});
+
+app.on('before-quit', () => {
+  isQuitting = true;
+});