feat: Day 10-11 - Agent Configuration System completed

Backend:
- Create agents.yaml config file with 12 agents definition
- Create Prompt templates for topic-evaluation agent
- Implement agentService.ts for loading and managing agent configs
- Create agentController.ts with CRUD operations
- Create agent routes (GET /agents, /agents/:id, etc.)
- Register agent routes in main server

Frontend:
- Create agentApi.ts service module
- Update AgentChatPage to dynamically load agent config from API
- Add loading state and error handling
- Display agent details (description, category, model)

Build: Both frontend and backend build successfully

backend/package.json

@@ -30,6 +30,7 @@
     "prisma": "^6.17.0"
   },
   "devDependencies": {
+    "@types/js-yaml": "^4.0.9",
     "@types/node": "^24.7.1",
     "nodemon": "^3.1.10",
     "pino-pretty": "^13.1.1",