feat: complete Dify platform deployment (Day 18)

## Dify 閮ㄧ讲瀹屾垚 鉁?
### 瀹屾垚鐨勫伐浣?1. Docker 闀滃儚鍔犻€熷櫒閰嶇疆
   - 閰嶇疆 5 涓浗鍐呴暅鍍忔簮
   - 澶у箙鎻愬崌涓嬭浇閫熷害鍜屾垚鍔熺巼

2. Dify 闀滃儚鎷夊彇 (鍏?11 涓湇鍔?
   - langgenius/dify-api:1.9.1
   - langgenius/dify-web:1.9.1
   - postgres, redis, weaviate, nginx 绛?   - 鎬诲ぇ灏忕害 2GB锛岃€楁椂绾?15 鍒嗛挓

3. Dify 鏈嶅姟鍚姩
   - 鉁?nginx (80/443)
   - 鉁?api, worker, worker_beat
   - 鉁?web (3000)
   - 鉁?db (PostgreSQL), redis
   - 鉁?weaviate (鍚戦噺鏁版嵁搴?
   - 鉁?sandbox, plugin_daemon, ssrf_proxy

4. Dify 鍒濆鍖栭厤缃?   - 鍒涘缓绠＄悊鍛樿处鍙?   - 鍒涘缓搴旂敤: AI Clinical Research
   - 鑾峰彇 API Key: app-VZRn0vMXdmltEJkvatHVGv5j

5. 鍚庣鐜閰嶇疆
   - DIFY_API_URL=http://localhost/v1
   - DIFY_API_KEY 宸查厤缃?
### 鏂囨。鏇存柊
- 鏂板: docs/05-姣忔棩杩涘害/Day18-Dify閮ㄧ讲瀹屾垚.md
- 鏇存柊: docs/04-寮€鍙戣鍒?寮€鍙戦噷绋嬬.md (Day 18 鏍囪涓哄畬鎴?

### 涓嬩竴姝?Day 19-24: 鐭ヨ瘑搴撶郴缁熷紑鍙?- Dify 瀹㈡埛绔皝瑁?- 鐭ヨ瘑搴撶鐞?CRUD
- 鏂囨。涓婁紶涓庡鐞?- @鐭ヨ瘑搴撻泦鎴?- RAG 闂瓟楠岃瘉

---
Progress: 閲岀▼纰?1 (MVP) 85% -> 鐭ヨ瘑搴撶郴缁熷紑鍙戜腑

backend/config/agents.yaml

@@ -307,3 +307,5 @@ agents:
 # - outputFormat: 输出格式（text/structured/document）
 # - tags: 标签列表
 
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backend/prompts/topic_evaluation_system.txt

@@ -117,3 +117,5 @@
 
 记住：你的评价将直接影响研究者的决策，因此要认真负责、专业严谨。
 
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backend/prompts/topic_evaluation_user.txt

@@ -13,3 +13,5 @@
 
 请根据创新性、临床价值、科学性和可行性四个维度，对上述选题进行全面评价，并给出改进建议。
 
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backend/src/adapters/LLMFactory.ts

@@ -75,3 +75,5 @@ export class LLMFactory {
   }
 }
 
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backend/src/adapters/types.ts

@@ -53,3 +53,5 @@ export interface ILLMAdapter {
 // 支持的模型类型
 export type ModelType = 'deepseek-v3' | 'qwen3-72b' | 'gemini-pro';
 
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backend/src/config/database.ts

@@ -33,3 +33,5 @@ process.on('beforeExit', async () => {
   await closeDatabaseConnection();
 });
 
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backend/src/controllers/agentController.ts

@@ -213,3 +213,5 @@ class AgentController {
 
 export const agentController = new AgentController();
 
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backend/src/middleware/validateProject.ts

@@ -108,3 +108,5 @@ export async function validateProjectUpdate(request: FastifyRequest, reply: Fast
   }
 }
 
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backend/src/services/agentService.ts

@@ -210,3 +210,5 @@ class AgentService {
 // 导出单例
 export const agentService = new AgentService();
 
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backend/启动后端.bat

@@ -8,3 +8,5 @@ cd /d %~dp0
 call npm run dev
 pause
 
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