feat: 清理 control_node + 引入 task 一等公民

- control_node 标注 DEPRECATED：保留目录壳子供未来远程探针节点复用，删除调用路径与相关测试
- 新增 task 表：极简元数据持久化 regulatory_node 完成的短任务（出报告/写文件/查询整理）
- regulatory_node 自标注：MessageResponse 扩展 task_action/title/summary，_run 末尾非阻塞落库
- query_task_list 改查 task 表，符合用户对"任务列表"的直觉，与 workflow 体系解耦
- 新增 /api/v1/task/list|/{id} 只读 API（task 由 regulatory 内部触发，不开放对外创建）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

kilostar/core/postgres_database/postgres.py

@@ -59,6 +59,7 @@ from .module.custom_toolset import CustomToolsetDatabase
 from .module.system_event_log import SystemEventLogDatabase
 from .module.persona_template import PersonaTemplateDatabase
 from .module.org_task import OrgTaskDatabase
+from .module.task import TaskDatabase
 
 
 @actor_class
@@ -93,6 +94,7 @@ class PostgresDatabase:
         self._system_event_log_database = SystemEventLogDatabase(self.async_session_maker)
         self._persona_template_database = PersonaTemplateDatabase(self.async_session_maker)
         self._org_task_database = OrgTaskDatabase(self.async_session_maker)
+        self._task_database = TaskDatabase(self.async_session_maker)
 
         self.ready_event = asyncio.Event()
 
@@ -487,3 +489,49 @@ class PostgresDatabase:
     async def query_org_events(self, task_id: str, limit=200):
         await self.ready_event.wait()
         return await self._org_task_database.query_events(task_id, limit)
+
+    # Task Methods（管控节点短任务）
+    async def create_task(
+        self,
+        task_id: str,
+        user_id: str,
+        command: str,
+        title: str,
+        chat_id: str | None = None,
+        status: str = "completed",
+        result_summary: str | None = None,
+        artifact_refs: list | None = None,
+    ):
+        await self.ready_event.wait()
+        return await self._task_database.create_task(
+            task_id=task_id,
+            user_id=user_id,
+            command=command,
+            title=title,
+            chat_id=chat_id,
+            status=status,
+            result_summary=result_summary,
+            artifact_refs=artifact_refs,
+        )
+
+    async def update_task_status(
+        self, task_id: str, status: str, result_summary: str | None = None
+    ):
+        await self.ready_event.wait()
+        return await self._task_database.update_status(task_id, status, result_summary)
+
+    async def get_task(self, task_id: str):
+        await self.ready_event.wait()
+        return await self._task_database.get_task(task_id)
+
+    async def list_tasks_by_user(
+        self,
+        user_id: str,
+        status: str | None = None,
+        limit: int = 20,
+        offset: int = 0,
+    ):
+        await self.ready_event.wait()
+        return await self._task_database.list_tasks_by_user(
+            user_id=user_id, status=status, limit=limit, offset=offset
+        )