fix(api): pass run_in_background parameter to memify function

The run_in_background parameter was defined in MemifyPayloadDTO but was
never passed to the cognee_memify function call, making the parameter
effectively unused. This fix passes the parameter so users can actually
run memify operations in the background.

Signed-off-by: Mike Potter <mpotter1@gmail.com>

cognee/api/v1/memify/routers/get_memify_router.py

@@ -90,6 +90,7 @@ def get_memify_router() -> APIRouter:
                 dataset=payload.dataset_id if payload.dataset_id else payload.dataset_name,
                 node_name=payload.node_name,
                 user=user,
+                run_in_background=payload.run_in_background,
             )
 
             if isinstance(memify_run, PipelineRunErrored):