fix: merge main into feature branch - resolve all merge conflicts cleanly

Merges origin/main (v0.156.0) into the classification feature branch,
properly resolving all 23 merge conflicts:

- Auto-generated files (BUILD_DATE, VERSION, etc.): accept main's version
- Non-classification files (SharePoint, QR auth, session mgmt, mobile): accept main's version
- Classification files (api/__init__.py, models.py, migrations/env.py, conftest.py):
  keep classification additions alongside main's content

Previously the branch was incorrectly removing files from main (SharePoint
integration, QR scanner, session management). This merge properly preserves
all main branch content while maintaining the classification feature additions.

Migration chain validated: 038_add_classification_rules chains from
037_add_user_sessions_and_qr_challenges.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/celery_worker.py

@@ -53,6 +53,7 @@ from app.tasks.upload_to_onedrive import upload_to_onedrive  # noqa: F401
 from app.tasks.upload_to_paperless import upload_to_paperless  # noqa: F401
 from app.tasks.upload_to_s3 import upload_to_s3  # noqa: F401
 from app.tasks.upload_to_sftp import upload_to_sftp  # noqa: F401
+from app.tasks.upload_to_sharepoint import upload_to_sharepoint  # noqa: F401
 from app.tasks.upload_to_user_integration import upload_to_user_integration  # noqa: F401
 from app.tasks.upload_to_webdav import upload_to_webdav  # noqa: F401
 from app.tasks.upload_with_rclone import send_to_all_rclone_destinations, upload_with_rclone  # noqa: F401