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

src/components/tabbar/TabContextMenu.tsx

@@ -0,0 +1,89 @@
+/**
+ * TabContextMenu - 标签右键菜单
+ */
+
+import { useRef, useEffect } from 'react'
+
+interface MenuItem {
+  label: string
+  action: () => void
+  danger?: boolean
+  separator?: boolean
+}
+
+interface TabContextMenuProps {
+  isOpen: boolean
+  position: { x: number; y: number }
+  onClose: () => void
+  onCloseTab: () => void
+  onCloseOthers: () => void
+  onCloseRight: () => void
+  onCloseLeft: () => void
+  onCloseAll: () => void
+  onClone?: () => void
+}
+
+export function TabContextMenu({
+  isOpen,
+  position,
+  onClose,
+  onCloseTab,
+  onCloseOthers,
+  onCloseRight,
+  onCloseLeft,
+  onCloseAll,
+  onClone,
+}: TabContextMenuProps) {
+  const menuRef = useRef<HTMLDivElement>(null)
+
+  useEffect(() => {
+    const handleClickOutside = (e: MouseEvent) => {
+      if (menuRef.current && !menuRef.current.contains(e.target as Node)) {
+        onClose()
+      }
+    }
+    document.addEventListener('mousedown', handleClickOutside)
+    return () => document.removeEventListener('mousedown', handleClickOutside)
+  }, [onClose])
+
+  if (!isOpen) return null
+
+  const items: MenuItem[] = [
+    { label: '关闭', action: onCloseTab },
+    { label: '关闭其他', action: onCloseOthers },
+    { label: '关闭右侧标签', action: onCloseRight },
+    { label: '关闭左侧标签', action: onCloseLeft },
+    { label: '关闭全部', action: onCloseAll, danger: true },
+  ]
+
+  if (onClone) {
+    items.unshift({ label: '克隆标签', action: onClone })
+  }
+
+  return (
+    <div
+      ref={menuRef}
+      style={{ left: position.x, top: position.y }}
+      className="fixed z-50 bg-dark-800 border border-dark-700 rounded-lg shadow-xl py-1 min-w-[160px]"
+    >
+      {items.map((item, index) => (
+        <button
+          key={index}
+          onClick={() => {
+            item.action()
+            onClose()
+          }}
+          className={`
+            w-full px-4 py-2 text-left text-sm transition-colors
+            ${item.danger 
+              ? 'text-red-400 hover:bg-red-500/20' 
+              : 'text-gray-300 hover:bg-dark-700'
+            }
+          `}
+        >
+          {item.label}
+        </button>
+      ))}
+    </div>
+  )
+}