feat: v0.3.0 版本 - SSH终端、SFTP、端口转发功能实现

核心功能:
- SSH终端: 密码/密钥认证、XTerm.js终端、多主题配色、IP高亮
- SFTP管理: 双栏文件管理、上传下载、传输队列
- 端口转发: 本地/远程转发、SOCKS5动态代理、规则管理

架构改进:
- 拆分大型组件 (SFTPView/TabBar/Sidebar)
- 添加统一日志和错误处理
- 修复React严格模式下的终端黑屏问题

UI更新:
- 新增端口转发视图
- 更新UI预览文档
- 左侧栏右键菜单支持SFTP快捷打开

electron/ipc/settings.ipc.ts

@@ -0,0 +1,41 @@
+/**
+ * Settings IPC Handlers
+ * 处理应用设置读写
+ */
+
+import { ipcMain, IpcMainInvokeEvent } from 'electron'
+import type { DatabaseService } from '../services/database-service'
+
+// IPC channel names
+export const SETTINGS_CHANNELS = {
+  GET: 'settings:get',
+  SET: 'settings:set',
+} as const
+
+export interface SettingsIPCOptions {
+  dbService: DatabaseService
+}
+
+export function registerSettingsIPCHandlers(options: SettingsIPCOptions): void {
+  const { dbService } = options
+
+  // Get setting
+  ipcMain.handle(SETTINGS_CHANNELS.GET, async (_event: IpcMainInvokeEvent, key: string) => {
+    try {
+      const value = dbService.getSetting(key)
+      return { success: true, value }
+    } catch (error: any) {
+      return { success: false, error: error.message }
+    }
+  })
+
+  // Set setting
+  ipcMain.handle(SETTINGS_CHANNELS.SET, async (_event: IpcMainInvokeEvent, key: string, value: unknown) => {
+    try {
+      dbService.setSetting(key, value)
+      return { success: true }
+    } catch (error: any) {
+      return { success: false, error: error.message }
+    }
+  })
+}