feat: 重写为 Tauri + React + TypeScript (v4.0)

完全移除旧 C+IUP 代码，改用 Tauri 2.x + React 19 + TypeScript + Rust 技术栈重写。
功能与 v3.1 完全等价：

- React 前端：Tailwind CSS 4、Zustand 状态管理、i18next 国际化
- Rust 后端：winreg 注册表读写、Win32 API FFI 调用
- 核心逻辑：StringList、UndoRedoManager、PathManager、Import/Export
- 深色模式、中英文切换、键盘快捷键、合并预览
- 66 个 Vitest 单元测试

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/hooks/use-keyboard.ts

@@ -0,0 +1,60 @@
+import { useEffect } from 'react';
+import { useAppStore } from '@/store/app-store';
+
+interface KeyboardActions {
+  onNew: () => void;
+  onSave: () => void;
+  onDelete: () => void;
+  onUndo: () => void;
+  onRedo: () => void;
+}
+
+/**
+ * 全局键盘快捷键
+ * Ctrl+N 新建, Ctrl+S 保存, Ctrl+Z 撤销, Ctrl+Y 重做, Delete 删除
+ */
+export function useKeyboard(actions: KeyboardActions) {
+  const isAdmin = useAppStore((s) => s.isAdmin);
+
+  useEffect(() => {
+    const handler = (e: KeyboardEvent) => {
+      // 如果焦点在输入框中，只响应 Escape
+      const tag = (e.target as HTMLElement)?.tagName;
+      const isInput = tag === 'INPUT' || tag === 'TEXTAREA' || tag === 'SELECT';
+
+      if (isInput) {
+        if (e.key === 'Escape') {
+          (e.target as HTMLElement).blur();
+        }
+        return;
+      }
+
+      if (!isAdmin) return;
+
+      const ctrl = e.ctrlKey || e.metaKey;
+
+      if (ctrl && e.key === 'z') {
+        e.preventDefault();
+        actions.onUndo();
+      } else if (ctrl && e.key === 'y') {
+        e.preventDefault();
+        actions.onRedo();
+      } else if (ctrl && e.key === 'n') {
+        e.preventDefault();
+        actions.onNew();
+      } else if (ctrl && e.key === 's') {
+        e.preventDefault();
+        actions.onSave();
+      } else if (e.key === 'Delete' || e.key === 'Backspace') {
+        e.preventDefault();
+        actions.onDelete();
+      } else if (e.key === 'F1') {
+        e.preventDefault();
+        // 帮助由 AppShell 处理
+      }
+    };
+
+    window.addEventListener('keydown', handler);
+    return () => window.removeEventListener('keydown', handler);
+  }, [isAdmin, actions]);
+}