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/commands/registry.rs

@@ -0,0 +1,83 @@
+use winreg::enums::*;
+use winreg::RegKey;
+
+const SYS_REG_PATH: &str = "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment";
+const USER_REG_PATH: &str = "Environment";
+const PATH_VALUE: &str = "Path";
+
+/// 从注册表加载系统 PATH
+#[tauri::command]
+pub fn load_system_paths() -> Result<Vec<String>, String> {
+    let hklm = RegKey::predef(HKEY_LOCAL_MACHINE);
+    let env_key = hklm
+        .open_subkey_with_flags(SYS_REG_PATH, KEY_READ)
+        .map_err(|e| format!("无法打开系统注册表项: {}", e))?;
+
+    let value: String = env_key
+        .get_value(PATH_VALUE)
+        .map_err(|e| format!("无法读取系统 PATH: {}", e))?;
+
+    Ok(split_path(&value))
+}
+
+/// 从注册表加载用户 PATH
+#[tauri::command]
+pub fn load_user_paths() -> Result<Vec<String>, String> {
+    let hkcu = RegKey::predef(HKEY_CURRENT_USER);
+    let env_key = hkcu
+        .open_subkey_with_flags(USER_REG_PATH, KEY_READ)
+        .map_err(|e| format!("无法打开用户注册表项: {}", e))?;
+
+    let value: String = env_key
+        .get_value(PATH_VALUE)
+        .map_err(|e| format!("无法读取用户 PATH: {}", e))?;
+
+    Ok(split_path(&value))
+}
+
+/// 保存系统 PATH 到注册表
+#[tauri::command]
+pub fn save_system_paths(paths: Vec<String>) -> Result<(), String> {
+    let hklm = RegKey::predef(HKEY_LOCAL_MACHINE);
+    let env_key = hklm
+        .open_subkey_with_flags(SYS_REG_PATH, KEY_WRITE)
+        .map_err(|e| format!("无法写入系统注册表（需要管理员权限）: {}", e))?;
+
+    let value = join_path(&paths);
+    env_key
+        .set_value(PATH_VALUE, &value)
+        .map_err(|e| format!("无法写入系统 PATH: {}", e))?;
+
+    log::info!("已保存系统 PATH，{} 个条目", paths.len());
+    Ok(())
+}
+
+/// 保存用户 PATH 到注册表
+#[tauri::command]
+pub fn save_user_paths(paths: Vec<String>) -> Result<(), String> {
+    let hkcu = RegKey::predef(HKEY_CURRENT_USER);
+    let env_key = hkcu
+        .open_subkey_with_flags(USER_REG_PATH, KEY_WRITE)
+        .map_err(|e| format!("无法写入用户注册表: {}", e))?;
+
+    let value = join_path(&paths);
+    env_key
+        .set_value(PATH_VALUE, &value)
+        .map_err(|e| format!("无法写入用户 PATH: {}", e))?;
+
+    log::info!("已保存用户 PATH，{} 个条目", paths.len());
+    Ok(())
+}
+
+/// 用分号分割 PATH 字符串
+fn split_path(raw: &str) -> Vec<String> {
+    raw.split(';')
+        .map(|s| s.trim().to_string())
+        .filter(|s| !s.is_empty())
+        .collect()
+}
+
+/// 用分号连接路径列表
+fn join_path(paths: &[String]) -> String {
+    paths.join(";")
+}