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

resources/views/city/viewer.blade.php

@@ -27,6 +27,13 @@
             {{ __('city.error') }}
         </div>
 
+        {{-- Gym equipment proximity prompt --}}
+        <div id="exercise-prompt"
+             style="display:none; position:absolute; bottom:1.4rem; left:50%; transform:translateX(-50%);
+                    z-index:20; background:rgba(20,83,45,.92); color:#bbf7d0; border:1px solid #4ade80;
+                    border-radius:.6rem; padding:.5rem 1rem; font-size:.95rem; font-weight:600; white-space:nowrap;">
+        </div>
+
         {{-- Hospital admission banner --}}
         <div id="hospital-banner"
              style="display:none; position:absolute; top:5.2rem; left:50%; transform:translateX(-50%);
@@ -44,9 +51,11 @@
             <div>{{ __('city.hud_hunger') }}: <span id="hud-hunger" style="color:#fca5a5;">—</span></div>
             <div>{{ __('city.hud_thirst') }}: <span id="hud-thirst" style="color:#7dd3fc;">—</span></div>
             <div>{{ __('city.hud_energy') }}: <span id="hud-energy" style="color:#86efac;">—</span></div>
+            <div>{{ __('city.hud_health') }}: <span id="hud-health" style="color:#f9a8d4;">—</span></div>
             <div>{{ __('city.hud_money') }}: <span id="hud-money" style="color:#fde68a;">—</span></div>
             <div>{{ __('city.hud_state') }}: <span id="hud-char-state" style="color:#c4b5fd;">—</span></div>
             <div>{{ __('city.hud_education') }}: <span id="hud-education">—</span></div>
+            <div>{{ __('city.hud_exercise') }}: <span id="hud-exercise-count" style="color:#c4b5fd;">—</span></div>
             <div style="margin-top:.35rem; color:#cbd5e1;">{{ __('city.hud_inventory') }}: <span id="hud-inv">—</span></div>
 
             <div style="margin-top:.6rem; color:#fff; font-weight:600;">{{ __('city.hud_actions') }}</div>
@@ -267,6 +276,12 @@
             hospitalTitle: @json(__('city.hospital_title')),
             hospitalLeft: @json(__('city.hospital_left')),
             hospitalReleased: @json(__('city.hospital_released')),
+            exerciseUse: @json(__('city.exercise_use')),
+            exerciseActive: @json(__('city.exercise_active')),
+            exerciseStopHint: @json(__('city.exercise_stopHint')),
+            exerciseStart: @json(__('city.exerciseStart')),
+            exerciseStop: @json(__('city.exerciseStop')),
+            exerciseMaxHealth: @json(__('city.exercise_max_health')),
         },
         citySlug: @json($city->slug),
     };