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/ipc.ts

@@ -0,0 +1,72 @@
+/**
+ * Metona Ollama Desktop - IPC 处理器
+ */
+
+import { ipcMain, dialog, shell } from 'electron';
+import * as fs from 'fs';
+import * as path from 'path';
+import { mainWindow } from './main.js';
+import { showNotification } from './utils.js';
+
+export function setupIPC(): void {
+  ipcMain.handle('dialog:openFile', async (_, options?: { filters?: Array<{ name: string; extensions: string[] }> }) => {
+    const result = await dialog.showOpenDialog(mainWindow!, {
+      properties: ['openFile', 'multiSelections'],
+      filters: options?.filters || [{ name: '所有文件', extensions: ['*'] }]
+    });
+    if (result.canceled) return null;
+    return result.filePaths;
+  });
+
+  ipcMain.handle('dialog:saveFile', async (_, options?: { defaultPath?: string; filters?: Array<{ name: string; extensions: string[] }> }) => {
+    const result = await dialog.showSaveDialog(mainWindow!, {
+      defaultPath: options?.defaultPath || 'export',
+      filters: options?.filters || [{ name: '所有文件', extensions: ['*'] }]
+    });
+    if (result.canceled) return null;
+    return result.filePath;
+  });
+
+  ipcMain.handle('fs:readFile', async (_, filePath: string) => {
+    try {
+      const content = await fs.promises.readFile(filePath, 'utf-8');
+      return { success: true, content, name: path.basename(filePath) };
+    } catch (err) {
+      return { success: false, error: (err as Error).message };
+    }
+  });
+
+  ipcMain.handle('fs:writeFile', async (_, filePath: string, content: string) => {
+    try {
+      await fs.promises.writeFile(filePath, content, 'utf-8');
+      return { success: true };
+    } catch (err) {
+      return { success: false, error: (err as Error).message };
+    }
+  });
+
+  ipcMain.handle('notify', (_: unknown, title: string, body: string) => {
+    showNotification(title, body);
+  });
+
+  ipcMain.handle('app:info', () => ({
+    version: require('electron').app.getVersion(),
+    platform: process.platform,
+    arch: process.arch,
+    electronVersion: process.versions.electron,
+    userDataPath: require('electron').app.getPath('userData')
+  }));
+
+  ipcMain.handle('window:minimize', () => mainWindow?.minimize());
+  ipcMain.handle('window:maximize', () => {
+    if (mainWindow?.isMaximized()) mainWindow.unmaximize();
+    else mainWindow?.maximize();
+  });
+  ipcMain.handle('window:close', () => mainWindow?.close());
+
+  ipcMain.handle('shell:openExternal', (_, url: string) => {
+    if (url.startsWith('http://') || url.startsWith('https://') || url.startsWith('mailto:')) {
+      shell.openExternal(url);
+    }
+  });
+}