refactor(backend): 更新 agent 服务和配置层

backend/src/v1/agent/service.py

@@ -168,10 +168,18 @@ class AgentService:
         )
         await self._repository.commit()
 
+        forwarded_props = getattr(run_input, "forwarded_props", None)
+        system_agent_mode = "worker"
+        if isinstance(forwarded_props, dict):
+            raw_mode = forwarded_props.get("system_agent_mode")
+            if isinstance(raw_mode, str) and raw_mode.strip():
+                system_agent_mode = raw_mode.strip().lower()
+
         task_id = await self._queue.enqueue(
             command={
                 "command": "run",
                 "owner_id": str(current_user.id),
+                "system_agent_mode": system_agent_mode,
                 "run_input": run_input.model_dump(
                     mode="json", by_alias=True, exclude_none=True
                 ),
@@ -185,45 +193,6 @@ class AgentService:
             created=created,
         )
 
-    async def load_agent_input_messages(
-        self,
-        *,
-        thread_id: str,
-    ) -> dict[str, object] | None:
-        """Load recent messages for runtime agent input.
-
-        Returns messages from today and yesterday (if exists).
-        """
-        today = await self._repository.get_history_day(
-            session_id=thread_id,
-            before=None,
-        )
-        if not today:
-            return None
-
-        yesterday = await self._repository.get_history_day(
-            session_id=thread_id,
-            before=self._parse_history_day(today.get("day")),
-        )
-
-        messages: list[dict[str, object]] = []
-        if yesterday and yesterday.get("messages"):
-            messages.extend(yesterday["messages"])  # type: ignore
-        if today.get("messages"):
-            messages.extend(today["messages"])  # type: ignore
-
-        return {"messages": messages}
-
-    def _parse_history_day(self, value: object) -> date | None:
-        if isinstance(value, date):
-            return value
-        if isinstance(value, str):
-            try:
-                return date.fromisoformat(value)
-            except ValueError:
-                return None
-        return None
-
     async def _prepare_user_message(
         self,
         *,