feat: implement auto-update functionality with GitHub integration

- Added AutoUpdater class to manage update checks and downloads.
- Integrated auto-updater in the main process after the main window is created.
- Enhanced preload script to expose update-related IPC channels.
- Created UpdateDialog component to handle user interactions for updates.
- Implemented state management for update status using Pinia store.
- Added localization support for update messages in multiple languages.
- Documented auto-update configuration steps for private GitHub repositories.
- Created .env.example for GitHub token configuration.

src/renderer/store/app.ts

@@ -0,0 +1,58 @@
+import { defineStore } from 'pinia'
+
+export interface UpdateStatus {
+  status: 'idle' | 'checking' | 'available' | 'not-available' | 'downloading' | 'downloaded' | 'error'
+  currentVersion?: string
+  error?: string
+  progress?: number
+}
+
+export const useAppStore = defineStore('app', {
+  state: () => ({
+    updateStatus: {
+      status: 'idle' as const
+    } as UpdateStatus,
+    updateDialogVisible: false,
+    downloadProgress: 0
+  }),
+
+  getters: {
+    isUpdateAvailable: (state) => state.updateStatus.status === 'available',
+    isCheckingForUpdates: (state) => state.updateStatus.status === 'checking',
+    hasUpdateError: (state) => state.updateStatus.status === 'error'
+  },
+
+  actions: {
+    setUpdateStatus(status: UpdateStatus['status'], currentVersion?: string, error?: string) {
+      this.updateStatus = { status, currentVersion, error }
+    },
+    
+    showUpdateDialog() {
+      this.updateDialogVisible = true
+    },
+    
+    hideUpdateDialog() {
+      this.updateDialogVisible = false
+    },
+    
+    setDownloadProgress(progress: number) {
+      this.downloadProgress = progress
+    },
+
+    // 启动更新下载
+    async startUpdateDownload() {
+      try {
+        this.setUpdateStatus('downloading')
+        const result = await window.mainApi.invoke('msgDownloadUpdate')
+        
+        if (result.success) {
+          this.setUpdateStatus('downloaded')
+        } else {
+          this.setUpdateStatus('error', undefined, result.error)
+        }
+      } catch (error) {
+        this.setUpdateStatus('error', undefined, error instanceof Error ? error.message : String(error))
+      }
+    }
+  }
+})