Fix undefined names and config router imports / task status update

backend/app/routers/action_config.py

@@ -51,7 +51,7 @@ def _not_found(name: str) -> HTTPException:
     )
 
 @router.get(
-    "/",
+    "",
     response_model=ActionListResponse,
     summary="List all available actions with active/inactive status",
 )
@@ -179,7 +179,7 @@ async def update_action(
 
 
 @router.post(
-    "/",
+    "",
     response_model=ActionConfig,
     status_code=status.HTTP_201_CREATED,
     summary="Create a new user-defined action",