F2: delegate prompt tasks to native Reasoner or OpenCode backends

backend/routes/background_tasks.py

@@ -12,7 +12,6 @@ router = APIRouter(prefix="/api/background-tasks", tags=["background-tasks"], de
 
 class SubmitTask(CamelModel):
     assistant_id: str
-    tool_id: str
     instruction: str = Field(min_length=1, max_length=12000)
     request_id: str = Field(min_length=1, max_length=80)
 
@@ -32,12 +31,15 @@ async def submit_task(body: SubmitTask, db=Depends(get_session)):
     cfg = await resolve_runtime_config(db, body.assistant_id)
     if cfg.type != "prompt" or cfg.runtimeMode != "pipeline":
         raise HTTPException(400, "后台任务仅支持提示词 Pipeline")
-    bound = {binding.tool_id for binding in cfg.tool_bindings}
-    tool = next((tool for tool in cfg.tools if tool.id == body.tool_id and tool.id in bound and tool.type == "task"), None)
-    if not tool:
-        raise HTTPException(400, "助手未绑定该任务工具")
+    if cfg.task_backend is None:
+        raise HTTPException(400, "助手未绑定任务后端")
     try:
-        return await task_service.submit(assistant_id=body.assistant_id, conversation_id="web_" + body.assistant_id, tool=tool, instruction=body.instruction, invocation_id=body.request_id)
+        return await task_service.submit(
+            assistant_id=body.assistant_id, conversation_id="web_" + body.assistant_id,
+            backend=cfg.task_backend, instruction=body.instruction, invocation_id=body.request_id,
+            variable_state={"values": cfg.dynamic_variables, "definitions": cfg.dynamic_variable_definitions,
+                            "secrets": cfg.secret_dynamic_variables},
+        )
     except ValueError as exc:
         raise HTTPException(400, str(exc)) from exc