6d094d17f0
- Add DocumentPatch Pydantic model with filename and folder_id optional fields
- Add PATCH /api/documents/{doc_id} endpoint: ownership guard, model_fields_set
to distinguish absent vs null folder_id, returns updated metadata dict
- Update _run() in document_tasks.py to use get_storage_backend_for_document
for non-MinIO backends instead of hardcoded MinIO path
- CloudConnectionError caught in cloud path: returns extract_failed status
- Update test to use pure unit mocks (no PostgreSQL) for _run() cloud routing
- All 3 plan tests pass; 23 test_cloud.py tests pass