Add frontend workspace UI and refactor plan

mactfsui/app/lib/electron/bridge.ts

@@ -0,0 +1,28 @@
+export interface ServiceStatus {
+  baseUrl: string
+  running: boolean
+  connected: boolean
+  message: string
+  tokenFile: string
+  configFile?: string
+  started?: boolean
+}
+
+export interface MacTfsBridge {
+  getToken(): Promise<string>
+  getServiceStatus(): Promise<ServiceStatus>
+  selectDirectory(): Promise<string | null>
+}
+
+declare global {
+  interface Window {
+    mactfs?: MacTfsBridge
+  }
+}
+
+/**
+ * 返回 preload 暴露的 macTFS 桥接对象，避免组件直接依赖 Electron 细节。
+ */
+export function getMactfsBridge() {
+  return window.mactfs
+}