refactor: 重构 schemas 结构，统一枚举定义

backend/src/v1/agent/service.py

@@ -18,8 +18,8 @@ from schemas.agent.forwarded_props import (
     RuntimeMode,
 )
 from schemas.agent.visibility import SystemVisibilityBit, bit_mask
-from schemas.automation import RuntimeConfig
-from schemas.messages.chat_message import (
+from schemas.domain.automation import RuntimeConfig
+from schemas.domain.chat_message import (
     AgentChatMessageMetadata,
     UserMessageAttachment,
     extract_user_message_attachments,
@@ -362,7 +362,7 @@ class AgentService:
         before: date | None,
         current_user: CurrentUser,
     ) -> HistorySnapshotResponse:
-        from schemas.messages.chat_message import AgentChatMessage
+        from schemas.domain.chat_message import AgentChatMessage
         from v1.agent.utils import convert_message_to_history
         from v1.agent.schemas import HistoryMessage