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/src/routes/agents.ts

@@ -0,0 +1,56 @@
+import { FastifyInstance, FastifyRequest, FastifyReply } from 'fastify';
+import { agentController } from '../controllers/agentController.js';
+
+interface AgentParams {
+  id: string;
+}
+
+export async function agentRoutes(fastify: FastifyInstance) {
+  // 获取所有智能体列表
+  fastify.get('/agents', async (request: FastifyRequest, reply: FastifyReply) => {
+    return agentController.getAllAgents(request, reply);
+  });
+
+  // 获取启用的智能体列表
+  fastify.get('/agents/enabled', async (request: FastifyRequest, reply: FastifyReply) => {
+    return agentController.getEnabledAgents(request, reply);
+  });
+
+  // 根据分类获取智能体
+  fastify.get<{ Querystring: { category: string } }>(
+    '/agents/by-category',
+    async (request: FastifyRequest<{ Querystring: { category: string } }>, reply: FastifyReply) => {
+      return agentController.getAgentsByCategory(request, reply);
+    }
+  );
+
+  // 获取单个智能体详情
+  fastify.get<{ Params: AgentParams }>(
+    '/agents/:id',
+    async (request: FastifyRequest<{ Params: AgentParams }>, reply: FastifyReply) => {
+      return agentController.getAgentById(request, reply);
+    }
+  );
+
+  // 获取智能体的系统Prompt
+  fastify.get<{ Params: AgentParams }>(
+    '/agents/:id/system-prompt',
+    async (request: FastifyRequest<{ Params: AgentParams }>, reply: FastifyReply) => {
+      return agentController.getSystemPrompt(request, reply);
+    }
+  );
+
+  // 渲染用户Prompt（预览）
+  fastify.post<{ Params: AgentParams }>(
+    '/agents/:id/render-prompt',
+    async (request: FastifyRequest<{ Params: AgentParams }>, reply: FastifyReply) => {
+      return agentController.renderPrompt(request, reply);
+    }
+  );
+
+  // 重新加载配置（管理员功能）
+  fastify.post('/agents/reload-config', async (request: FastifyRequest, reply: FastifyReply) => {
+    return agentController.reloadConfig(request, reply);
+  });
+}
+