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-tauri/src/lib.rs

@@ -0,0 +1,31 @@
+mod commands;
+mod error;
+
+#[cfg_attr(mobile, tauri::mobile_entry_point)]
+pub fn run() {
+    tauri::Builder::default()
+        .setup(|app| {
+            if cfg!(debug_assertions) {
+                app.handle().plugin(
+                    tauri_plugin_log::Builder::default()
+                        .level(log::LevelFilter::Info)
+                        .build(),
+                )?;
+            }
+            Ok(())
+        })
+        .invoke_handler(tauri::generate_handler![
+            commands::registry::load_system_paths,
+            commands::registry::load_user_paths,
+            commands::registry::save_system_paths,
+            commands::registry::save_user_paths,
+            commands::system::check_admin,
+            commands::system::validate_path,
+            commands::system::expand_env_vars,
+            commands::system::broadcast_env_change,
+            commands::backup::backup_registry,
+            commands::backup::get_appdata_dir,
+        ])
+        .run(tauri::generate_context!())
+        .expect("error while running tauri application");
+}