Add staff-only all comments page and bump versions

- Add new "alle-kommentare" (all comments) view for staff users only
  - Allows staff to view and manage all user comments across the system
  - Grouped by document with user information displayed
  - Staff can delete any comment via the dedicated delete button
  - Restricts access via user_passes_test decorator

- Create all_comments.html template
  - Based on user_comments template with added username field
  - Shows comment author, creation time, and edit time
  - Provides delete functionality for comment management

- Update navigation menu
  - Add "Alle Kommentare" link in user dropdown menu
  - Link only visible to staff members

- Add URL route for alle-kommentare page
  - Path: /dokumente/alle-kommentare/
  - URL name: all_comments

- Bump application versions
  - Update footer version from 0.965 to 0.966
  - Update K8s deployment version from 0.917 to 0.918
  - ArgoCD deployment already at 0.966

All existing tests pass (148 tests total)

Dockerfile

@@ -21,7 +21,7 @@ ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
 USER appuser
 EXPOSE 8000
-RUN rm -rf /app/Dockerfile* \
+RUN rm -rvf /app/Dockerfile* \
            /app/README.md \
            /app/argocd \
            /app/k8s \
@@ -31,6 +31,6 @@ RUN rm -rf /app/Dockerfile* \
            /app/node_modules \
            /app/*.json \
            /app/test_*.py && \
-    python3 manage.py collectstatic
+       python3 /app/manage.py collectstatic --noinput
 CMD ["gunicorn","--bind","0.0.0.0:8000","--workers","3","VorgabenUI.wsgi:application"]