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

lang/en.json

@@ -192,7 +192,7 @@
     "city.citizens_near": "Citizens",
     "city.apply_job": "Apply for",
     "city.buy_hint": "Buys 1 food + 1 water + 10 materials",
-    "city.hospital_hit": "You were hit by a vehicle! Hospitalized for 2 days.",
+    "city.hospital_hit": "You were hit by a vehicle! Hospitalized for 1 hour.",
     "city.hospital_already": "You are already in the hospital.",
     "city.hospital_blocked": "You are hospitalized and cannot do that right now.",
     "city.hospital_bed": "Hospitalized",
@@ -204,5 +204,17 @@
     "city.vol_music": "Music",
     "city.vol_sfx": "Effects",
     "city.mute": "Mute",
-    "city.audio_hint": "Volume saved on this device."
+    "city.audio_hint": "Volume saved on this device.",
+    "city.hud_health": "Health",
+    "city.hud_exercise": "Workouts",
+    "city.exercise_use": "Press E to exercise",
+    "city.exercise_active": "Exercising",
+    "city.exercise_stopHint": "to stop",
+    "city.exercise_ok": "Nice! +2 health.",
+    "city.exercise_need_equipment": "Get closer to plaza gym equipment.",
+    "city.exercise_need_awake": "You must be awake to exercise.",
+    "city.exercise_tired": "You are too tired to exercise.",
+    "city.exercise_max_health": "Health is already at maximum!",
+    "city.exerciseStart": "Starting exercise…",
+    "city.exerciseStop": "Exercise stopped."
 }

lang/es.json

@@ -192,7 +192,7 @@
     "city.citizens_near": "Ciudadanos",
     "city.apply_job": "Solicitar",
     "city.buy_hint": "Compra 1 comida + 1 agua + 10 materiales",
-    "city.hospital_hit": "¡Te atropelló un vehículo! Internado en el hospital por 2 días.",
+    "city.hospital_hit": "¡Te atropelló un vehículo! Internado en el hospital por 1 hora.",
     "city.hospital_already": "Ya está internado en el hospital.",
     "city.hospital_blocked": "Está internado y no puede hacer eso ahora.",
     "city.hospital_bed": "Internado en el hospital",
@@ -204,5 +204,17 @@
     "city.vol_music": "Música",
     "city.vol_sfx": "Efectos",
     "city.mute": "Silenciar",
-    "city.audio_hint": "Volumen guardado en este dispositivo."
+    "city.audio_hint": "Volumen guardado en este dispositivo.",
+    "city.hud_health": "Salud",
+    "city.hud_exercise": "Ejercicios",
+    "city.exercise_use": "Pulse E para ejercitarse",
+    "city.exercise_active": "Ejercitándose",
+    "city.exercise_stopHint": "para parar",
+    "city.exercise_ok": "¡Bien! +2 de salud.",
+    "city.exercise_need_equipment": "Acérquese a un equipo de la plaza.",
+    "city.exercise_need_awake": "Debe estar despierto para ejercitarse.",
+    "city.exercise_tired": "Está demasiado cansado para ejercitarse.",
+    "city.exercise_max_health": "¡La salud ya está en el máximo!",
+    "city.exerciseStart": "Empezando a ejercitarse…",
+    "city.exerciseStop": "Ejercicio terminado."
 }

lang/pt_BR.json

@@ -192,7 +192,7 @@
     "city.citizens_near": "Cidadãos",
     "city.apply_job": "Aplicar para",
     "city.buy_hint": "Compra 1 comida+1 água+10 materiais",
-    "city.hospital_hit": "Você foi atropelado! Internado no hospital por 2 dias.",
+    "city.hospital_hit": "Você foi atropelado! Internado no hospital por 1 hora.",
     "city.hospital_already": "Você já está internado no hospital.",
     "city.hospital_blocked": "Você está internado no hospital e não pode fazer isso agora.",
     "city.hospital_bed": "Internado no hospital",
@@ -204,5 +204,17 @@
     "city.vol_music": "Música",
     "city.vol_sfx": "Efeitos",
     "city.mute": "Mudo",
-    "city.audio_hint": "Volume salvo neste dispositivo."
+    "city.audio_hint": "Volume salvo neste dispositivo.",
+    "city.hud_health": "Saúde",
+    "city.hud_exercise": "Exercícios",
+    "city.exercise_use": "Pressione E para exercitar",
+    "city.exercise_active": "Exercitando",
+    "city.exercise_stopHint": "para parar",
+    "city.exercise_ok": "Boa! +2 de saúde.",
+    "city.exercise_need_equipment": "Aproxime-se de um equipamento da praça.",
+    "city.exercise_need_awake": "Você precisa estar acordado para se exercitar.",
+    "city.exercise_tired": "Você está cansado demais para se exercitar.",
+    "city.exercise_max_health": "Saúde já está no máximo!",
+    "city.exerciseStart": "Começando a se exercitar…",
+    "city.exerciseStop": "Exercício encerrado."
 }