refactor: split api dependencies by domain

app/api/dependencies/agent.py

@@ -0,0 +1,29 @@
+"""Agent 与消息查询依赖。"""
+
+from fastapi import Depends
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.api.context import get_agent_chat_repository, get_agent_chat_transaction
+from app.api.data import get_async_db
+from app.api.dependencies.data import repository
+from app.application.messaging.chat import (
+    AgentChatService,
+    AsyncAgentChatRepository,
+    AsyncUnitOfWork,
+)
+from app.application.messaging.message import MessageQueryService
+
+
+def get_agent_chat_service(
+    chat_repository: AsyncAgentChatRepository = Depends(get_agent_chat_repository),
+    unit_of_work: AsyncUnitOfWork = Depends(get_agent_chat_transaction),
+) -> AgentChatService:
+    """组装类型化 Agent 会话历史查询和删除服务。"""
+    return AgentChatService(chat_repository, unit_of_work)
+
+
+def get_message_query_service(
+    db: AsyncSession = Depends(get_async_db),
+) -> MessageQueryService:
+    """组装消息历史异步查询服务。"""
+    return MessageQueryService(repository=repository("message", db))