feat: PATH 配置文件/预设切换 — 保存、加载、一键应用不同场景的 PATH 配置

- 新增 profiles.rs: list/save/load/delete/rename 五个 Rust 命令
- 配置文件存储在 %APPDATA%/.patheditor/profiles/<name>.json
- ProfileDialog: 保存当前 PATH、加载预览、一键应用到注册表
- 工具栏新增「配置」按钮

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

src-tauri/src/lib.rs

@@ -30,6 +30,11 @@ pub fn run() {
             commands::disabled::load_disabled_state,
             commands::scanner::scan_conflicts,
             commands::scanner::scan_tools,
+            commands::profiles::list_profiles,
+            commands::profiles::save_profile,
+            commands::profiles::load_profile,
+            commands::profiles::delete_profile,
+            commands::profiles::rename_profile,
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");