feat: add system tools and state updates

backend/db/models.py

@@ -154,6 +154,8 @@ class Assistant(Base):
     enable_interrupt: Mapped[bool] = mapped_column(Boolean, default=True)
     turn_config: Mapped[dict] = mapped_column(JSON, default=dict)
     startup: Mapped[dict] = mapped_column(JSON, default=dict)
+    # Prompt 助手级系统工具；Workflow 的权限保存在各 Agent 节点中。
+    system_tools: Mapped[list] = mapped_column(JSON, default=list)
     vision_enabled: Mapped[bool] = mapped_column(Boolean, default=False)
     vision_model_resource_id: Mapped[str | None] = mapped_column(
         String(40),

backend/db/session.py

@@ -54,12 +54,13 @@ async def sync_default_tools() -> None:
             "id": "tool_end_call_default",
             "name": "结束对话",
             "function_name": "end_call",
-            "type": "end_call",
+            "type": "system",
             "description": "当用户明确要求结束对话，或任务已完成时调用。",
             "definition": {
                 "schema_version": 1,
-                "type": "end_call",
+                "type": "system",
                 "config": {
+                    "kind": "end_conversation",
                     "message_type": "none",
                     "custom_message": "",
                     "capture_reason": True,