Wraps refresh_all / refresh_year Celery tasks behind the existing
AdminTokenAuth gate so the table can be populated on demand after
first deploy instead of waiting for the monthly beat (1st of month).
- TriggerEkburgPermitsRequest: year int|None, ge=2022 le=2030
- year=None -> refresh_all.apply_async() (scope all_years_2022_2026)
- year=N -> refresh_year.apply_async(args=[N]) (scope year_N)
- 4 smoke tests: all/year/invalid_year/no_token
