Delete Document Api

Delete a document and all its associated data.

Args: collection_name: Name of the collection filename: Document filename (will be used to find doc_id)

Returns: Deletion result with status, list of deleted doc_ids, and filename

Note: This endpoint uses filename lookup which may have a race condition if the same filename is uploaded multiple times concurrently. For production use, consider using doc_id directly or adding a filename index column.