v2.0.0: 主题系统+SSH私钥解析修复+会话持久化+连接池优化+UI打磨

核心修复:
- ssh-service.ts: 新增 resolvePrivateKey()，将私钥文件路径(~/.ssh/id_rsa)解析为内容后传给 ssh2，
  解决 'Cannot parse privateKey: Unsupported key format' 错误
- useTerminalConnection.ts + sessionHelper.ts: 根据 authType 过滤字段，password/agent 认证不再传 privateKey
- sessionStore.ts: addSession() 现在先调用 sessionCreate() 持久化到 SQLite，解决恢复标签'无可用连接信息'问题
- database-service.ts: updateSession() 补充 private_key_path 字段持久化
- SessionDialog.tsx: 默认 username='root'、privateKey='~/.ssh/id_rsa'

UI/UX:
- 语义化主题系统(app-theme.ts)，强制深色模式，全局无边框设计
- macOS 标题栏支持双击最大化(window:toggleMaximize IPC)
- macOS 菜单栏('OpsXShell' 应用菜单 + Settings Cmd+,)
- WelcomeView 4卡片布局，移除 Settings 按钮
- TabBar/TabItem 背景色统一(bg-dark-800/900)，消除白色边框线

架构优化:
- SFTP 生命周期修复(useSFTP.ts useRef + autoConnectAttempted guard)
- 连接池竞态修复，支持快速多标签连接
- IPC 接口规范化，安全错误处理
- Vite 代码分割优化

质量: lint零错误 | tsc零错误 | build成功 | 49 tests pass

vite.config.ts

@@ -9,23 +9,42 @@ export default defineConfig({
   build: {
     outDir: 'dist',
     emptyOutDir: true,
+    sourcemap: true,
+    cssCodeSplit: true,
     rollupOptions: {
       output: {
         manualChunks: {
+          'vendor-core': ['react', 'react-dom', 'react-router-dom'],
           'vendor-xterm': ['@xterm/xterm', '@xterm/addon-fit', '@xterm/addon-search', '@xterm/addon-webgl'],
-          'vendor-react': ['react', 'react-dom'],
-          'vendor-lucide': ['lucide-react'],
-          'vendor-zustand': ['zustand'],
+          'vendor-utils': ['zustand', 'lucide-react'],
+        },
+        chunkFileNames: 'assets/js/[name]-[hash].js',
+        entryFileNames: 'assets/js/[name]-[hash].js',
+        assetFileNames: (assetInfo) => {
+          const info = assetInfo.name || ''
+          if (/\.(png|jpe?g|gif|svg|webp|ico)$/i.test(info)) {
+            return 'assets/images/[name]-[hash][extname]'
+          }
+          if (/\.css$/i.test(info)) {
+            return 'assets/css/[name]-[hash][extname]'
+          }
+          return 'assets/[name]-[hash][extname]'
         },
       },
     },
+    assetsInlineLimit: 4096,
   },
   resolve: {
     alias: {
       '@': path.resolve(__dirname, './src'),
+      '@shared': path.resolve(__dirname, './shared'),
     },
   },
   server: {
     port: 5173,
+    strictPort: true,
+  },
+  optimizeDeps: {
+    include: ['@xterm/xterm', '@xterm/addon-fit', '@xterm/addon-search', '@xterm/addon-webgl', 'react', 'react-dom'],
   },
 })