refactor(backend): incremental architecture evolution (Task 19)

- Add common/ layer for shared capabilities (LLM, RAG, document, middleware)
- Add legacy/ layer for existing business code
- Move files to new structure (controllers, routes, services)
- Update index.ts for new route registration
- System remains fully functional

backend/src/index.ts

@@ -3,11 +3,13 @@ import cors from '@fastify/cors';
 import multipart from '@fastify/multipart';
 import { config, validateEnv } from './config/env.js';
 import { testDatabaseConnection, prisma } from './config/database.js';
-import { projectRoutes } from './routes/projects.js';
-import { agentRoutes } from './routes/agents.js';
-import { conversationRoutes } from './routes/conversations.js';
-import knowledgeBaseRoutes from './routes/knowledgeBases.js';
-import { chatRoutes } from './routes/chatRoutes.js';
+import { projectRoutes } from './legacy/routes/projects.js';
+import { agentRoutes } from './legacy/routes/agents.js';
+import { conversationRoutes } from './legacy/routes/conversations.js';
+import knowledgeBaseRoutes from './legacy/routes/knowledgeBases.js';
+import { chatRoutes } from './legacy/routes/chatRoutes.js';
+import { batchRoutes } from './legacy/routes/batchRoutes.js';
+import reviewRoutes from './legacy/routes/reviewRoutes.js';
 
 
 // 全局处理BigInt序列化
@@ -93,6 +95,12 @@ await fastify.register(knowledgeBaseRoutes, { prefix: '/api/v1' });
 // 注册通用对话路由
 await fastify.register(chatRoutes, { prefix: '/api/v1' });
 
+// Phase 3: 注册批处理路由
+await fastify.register(batchRoutes, { prefix: '/api/v1' });
+
+// 注册稿件审查路由
+await fastify.register(reviewRoutes, { prefix: '/api/v1' });
+
 // 启动服务器
 const start = async () => {
   try {