## Problem
The SDK API endpoint `DELETE /datasets/{dataset_id}/chunks` only updates
database status but does not send cancellation signal via Redis, causing
background parsing tasks to continue and eventually complete (status
becomes DONE instead of CANCEL).
## Root Cause
The SDK endpoint was missing the `cancel_all_task_of(id)` call that the
web API
([api/apps/document_app.py](cci:7://file:///d:/workspace1/ragflow-admin/api/apps/document_app.py:0:0-0:0))
uses to properly stop background tasks.
## Solution
Added `cancel_all_task_of(id)` call in the
[stop_parsing](cci:1://file:///d:/workspace1/ragflow/api/apps/sdk/doc.py:785:0-855:23)
function to send cancellation signal via Redis, consistent with the web
API behavior.
## Related Issue
Fixes#11745
Co-authored-by: tedhappy <tedhappy@users.noreply.github.com>
ad03ede7cd