🎉 **Introduce meetup activity management**

- 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`).

resources/views/livewire/cities/edit.blade.php

@@ -39,8 +39,17 @@ class extends Component {
             'longitude' => ['required', 'numeric', 'between:-180,180'],
             'population' => ['nullable', 'integer', 'min:0'],
             'population_date' => ['nullable', 'string', 'max:255'],
+        ], [], [
+            'latitude' => __('Breitengrad'),
+            'longitude' => __('Längengrad'),
         ]);
 
+        if ((float) $validated['latitude'] === 0.0 && (float) $validated['longitude'] === 0.0) {
+            $this->addError('latitude', __('Breiten- und Längengrad dürfen nicht beide 0 sein.'));
+
+            return;
+        }
+
         $validated['slug'] = str($validated['name'])->slug();
 
         $this->city->update($validated);