feat(city): add plaza exercise system with health tracking

- Adds CityPlazas support class for deterministic public plaza generation with outdoor gym equipment
- Implements exercise and stop-exercise actions with proximity validation to equipment
- Introduces health (0-100) and exercise_count attributes to Character model
- Reduces hospital stay duration from two game days to one game hour
- Adds 3D gym equipment rendering (bench, bars, bike, treadmill) in city viewer
- Includes exercise state machine handling in world ticker with energy drain
- Adds comprehensive PlazaExerciseTest and updates HospitalAdmissionTest
- Provides localized UI strings for health HUD and exercise prompts

app/Http/Controllers/Web/CityViewerController.php

@@ -9,6 +9,7 @@ use App\Models\Character;
 use App\Models\City;
 use App\Models\Job;
 use App\Models\Store;
+use App\Support\CityPlazas;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Auth;
@@ -128,7 +129,9 @@ class CityViewerController extends Controller
                 'energy' => (int) $me->energy,
                 'hunger' => (int) $me->hunger,
                 'thirst' => (int) $me->thirst,
+                'health' => (int) $me->health,
                 'education' => (int) $me->education,
+                'exercise_count' => (int) $me->exercise_count,
                 'job_id' => $me->job_id,
                 'job_title' => $me->job?->title,
                 'house_id' => $me->house_id,
@@ -137,6 +140,7 @@ class CityViewerController extends Controller
                 'inventory' => $me->inventory()->get()->mapWithKeys(fn ($i) => [$i->item => (int) $i->qty])->all(),
             ] : null,
             'layout' => $this->cityLayout($city, $stores->all()),
+            'plazas' => CityPlazas::forCity($city),
             'agents' => AiAgent::orderBy('id')->get()->map(fn ($a): array => [
                 'id' => $a->id,
                 'name' => $a->name,