feat: add user preferences, agent name desensitization and related improvements

- Add user preferences persistence (model, migration, router, frontend core)
- Add agent name desensitization config
- Add agent_id to user custom prompts with migration
- Enhance agents persistence (base, memory, model, sql) and scheduler service
- Improve frontend agent cards/gallery, scheduled tasks, custom prompt menu
- Add pagination UI component; remove stale package-lock.json

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend-web/tsconfig.json

@@ -21,7 +21,9 @@
     "paths": {
       "@/env": ["./src/env.ts"],
       "@/*": ["./src/*"],
-      "@vite/*": ["./src/*"]
+      "@vite/*": ["./src/*"],
+      "next/navigation": ["./src/shims/next-navigation.ts"],
+      "next/link": ["./src/shims/next-link.tsx"]
     },
     "types": ["vite/client"]
   },