feat(skills): add install from ZIP file feature

- Add open_zip_file_dialog command for selecting ZIP files
- Add install_from_zip service method with recursive skill scanning
- Add install_skills_from_zip Tauri command
- Add frontend API methods and useInstallSkillsFromZip hook
- Add "Install from ZIP" button in Skills management page
- Support local skill ID format: local:{directory}
- Add i18n translations for new feature and error messages

src-tauri/src/lib.rs

@@ -850,6 +850,7 @@ pub fn run() {
             commands::import_config_from_file,
             commands::save_file_dialog,
             commands::open_file_dialog,
+            commands::open_zip_file_dialog,
             commands::sync_current_providers_live,
             // Deep link import
             commands::parse_deeplink,
@@ -879,6 +880,7 @@ pub fn run() {
             commands::get_skill_repos,
             commands::add_skill_repo,
             commands::remove_skill_repo,
+            commands::install_skills_from_zip,
             // Auto launch
             commands::set_auto_launch,
             commands::get_auto_launch_status,