完成：词典和资讯 API 支持 async 和数据库缓存

backend/app/backend.py

@@ -24,7 +24,10 @@ from .agent_subgraphs.common.human_review import (
     HumanReview
 )
 from .agent_subgraphs.contact.api_client import ContactAPIClient
+from .agent_subgraphs.dictionary.api_client import DictionaryAPIClient
+from .agent_subgraphs.news_analysis.api_client import NewsAPIClient
 from .db.init_db import init_subgraph_tables
+from .db.models import ContactRepository, DictionaryRepository, NewsRepository
 from .logger import info, error
 
 @asynccontextmanager
@@ -42,10 +45,17 @@ async def lifespan(app: FastAPI):
         await agent_service.initialize()
         
         # 3. 创建历史查询服务
-        history_service = ThreadHistoryService(checkpointer)
+        history_service = ThreadHistoryService(checkpointer.conn)
         
-        # 3.5 创建子图 API 客户端（真实数据库模式）
+        # 3.5 创建子图 Repositories
+        contact_repo = ContactRepository(checkpointer.conn)
+        dictionary_repo = DictionaryRepository(checkpointer.conn)
+        news_repo = NewsRepository(checkpointer.conn)
+        
+        # 3.6 创建子图 API 客户端（真实数据库模式）
         contact_api = ContactAPIClient(checkpointer.conn)
+        dictionary_api = DictionaryAPIClient(word_repository=dictionary_repo)
+        news_api = NewsAPIClient(news_repository=news_repo)
         
         # 4. 创建审核管理器
         review_manager = ReviewManager(InMemoryReviewStore())
@@ -55,6 +65,11 @@ async def lifespan(app: FastAPI):
         app.state.history_service = history_service
         app.state.review_manager = review_manager
         app.state.contact_api = contact_api
+        app.state.dictionary_api = dictionary_api
+        app.state.news_api = news_api
+        app.state.contact_repo = contact_repo
+        app.state.dictionary_repo = dictionary_repo
+        app.state.news_repo = news_repo
         
         # 应用运行中...
         yield