fix(ci): lint errors, remove webhook deploy, add ArgoCD GitOps k8s manifest update

- Fix ruff format: add blank line before nested function in app/views/filemanager.py
- Fix ruff format: use double-quote escaping in tests/test_config.py
- Remove deploy job (Portainer webhook) from ci.yml
- Add update-k8s-manifest job: after main-branch build, updates
  apps/docuelevate/preprod/docuelevate-stack.yaml in christianlouis/k8s-cluster-state
  with the new GHCR image tag (ghcr.io/christianlouis/docuelevate:main-<short-sha>)
  using mikefarah/yq@v4.44.6 and GH_PAT secret for cross-repo write access

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

app/views/filemanager.py

@@ -172,6 +172,7 @@ def _db_records(db: Session, workdir_base: Path) -> List[Dict[str, Any]]:
     """
     rows = []
     for rec in db.query(FileRecord).order_by(FileRecord.id.desc()).all():
+
         def _check(p: str | None) -> Dict[str, Any]:
             if not p:
                 return {"path": None, "exists": None, "rel": None}