feat: Enhance Marketplace and Skill Management UI with improved error handling and user feedback

- Updated MarketplaceDrawer to include security notes and manual installation hints.
- Refactored SkillDetailDrawer to display default icons for skills.
- Simplified SkillListItem to use default icons for better readability.
- Integrated gateway status checks and warnings in SkillsPage for improved user awareness.
- Enhanced error handling for skill installation and fetching, providing clearer feedback to users.
- Added new translations for error messages and gateway warnings to improve localization support.

electron/main.ts

@@ -14,6 +14,7 @@ import { onProviderChange } from '@electron/service/provider-api-service';
 import { gatewayManager } from '@electron/gateway/manager';
 import { dispatchLocalHostApi } from '@electron/api/router';
 import { syncProviderRuntimeSnapshot } from '@electron/service/provider-runtime-sync';
+import { ensureBuiltinSkillsInstalled, ensurePreinstalledSkillsInstalled } from '@electron/utils/skill-config';
 
 // 初始化 updater，确保在 app ready 之前或者之中注册好 IPC
 appUpdater.init();
@@ -114,6 +115,14 @@ app.whenReady().then(async () => {
   await configManager.init();
   await themeManager.init();
 
+  void ensureBuiltinSkillsInstalled().catch((error) => {
+    log.warn('Failed to install built-in skills:', error);
+  });
+
+  void ensurePreinstalledSkillsInstalled().catch((error) => {
+    log.warn('Failed to install preinstalled skills:', error);
+  });
+
   gatewayManager.init();
   refreshProviderRuntime();