feat(city): add pedestrian traffic signals with walk/wait indicators

- Adds 3D pedestrian signal heads at each intersection corner
- Implements pedestrian signal state logic tied to vehicle traffic phases
- Displays localized wait banner when pedestrian signal is red
- Includes test asset for pedestrian signal visualization

resources/views/city/viewer.blade.php

@@ -27,6 +27,13 @@
             {{ __('city.error') }}
         </div>
 
+        {{-- Pedestrian red-light wait banner --}}
+        <div id="ped-wait"
+             style="display:none; position:absolute; bottom:4.2rem; left:50%; transform:translateX(-50%);
+                    z-index:20; background:rgba(127,29,29,.92); color:#fecaca; border:1px solid #f87171;
+                    border-radius:.6rem; padding:.5rem 1rem; font-size:.95rem; font-weight:600; white-space:nowrap;">
+        </div>
+
         {{-- Gym equipment proximity prompt --}}
         <div id="exercise-prompt"
              style="display:none; position:absolute; bottom:1.4rem; left:50%; transform:translateX(-50%);
@@ -282,6 +289,7 @@
             exerciseStart: @json(__('city.exerciseStart')),
             exerciseStop: @json(__('city.exerciseStop')),
             exerciseMaxHealth: @json(__('city.exercise_max_health')),
+            pedRed: @json(__('city.ped_red')),
         },
         citySlug: @json($city->slug),
     };