- Added `is_active` and `last_event_at` fields to meetups with migration.
- Enhanced UI: Display `Aktiv`/`Inaktiv` badges and last event dates across dashboard, tables, and maps.
- Introduced `/meetups:update-activity` command to manage activity flags and timestamps.
- Validated latitude/longitude to prevent `0,0` inputs in city creation and updates.
- Updated factories and tests to include meetup activity states (`active`, `inactive`).

In den Modals der Map Points auf der Karte müssen die Uhrzeiten von UTC in die User Zeitzone umgeschrieben werden.
- Added `meetup-popup` Blade component to display detailed meetup information.
- Updated map markers to show custom popup HTML with event and contact links.
- Enhanced map query with additional fields and upcoming event details.
- Styled Leaflet popups for better appearance.