feat(city): add city landmarks, stores, luminous signs, and ATC echo guard

Add university and fire station civic buildings plus 7 new store types,
each with facade and luminous blade signs. Extend landmark material
colors and sign accents. Fix ATC dispatch to reject prompt-echoing AI
responses via heuristic guard. Add CityPlacesTest for collision and
roadway avoidance, and extend AirportTest and SignLabelsTest.

database/seeders/CityContentSeeder.php

@@ -119,7 +119,7 @@ class CityContentSeeder extends Seeder
                 'description' => 'Material de construção e ferramentas.',
                 'type' => 'hardware',
                 'owner_id' => $shopkeeper?->id,
-                'pos_x' => 8, 'pos_y' => 0, 'pos_z' => 6,
+                'pos_x' => 11, 'pos_y' => 0, 'pos_z' => 10,
                 'width' => 10, 'height' => 7, 'depth' => 10,
                 'is_open' => true,
             ],

database/seeders/CityWorldSeeder.php

@@ -136,6 +136,65 @@ class CityWorldSeeder extends Seeder
             ],
         );
 
+        // More civic landmarks (rendered with luminous letreiros).
+        Building::updateOrCreate(
+            ['city_id' => $city->id, 'type' => 'university'],
+            [
+                'owner_character_id' => null,
+                'name' => 'Universidade City10',
+                'pos_x' => 100,
+                'pos_z' => 140,
+                'width' => 26,
+                'depth' => 18,
+                'height' => 12,
+                'is_complete' => true,
+                'build_progress' => 100,
+            ],
+        );
+        Building::updateOrCreate(
+            ['city_id' => $city->id, 'type' => 'fire_station'],
+            [
+                'owner_character_id' => null,
+                'name' => 'Corpo de Bombeiros',
+                'pos_x' => -100,
+                'pos_z' => -20,
+                'width' => 20,
+                'depth' => 14,
+                'height' => 9,
+                'is_complete' => true,
+                'build_progress' => 100,
+            ],
+        );
+
+        // ---- City places (all get facade + front board + blade letreiro)
+        // Each sits on its own free block zone (not on a plaza row), so
+        // the plaza pattern and the AABB audit both stay clean.
+        $places = [
+            ['Supermercado Bom Preço', 'supermarket', 100, -20, 22, 9, 16, 'Grande sortimento, hortifrúti e padaria interna.'],
+            ['Drogaria Saúde Total', 'pharmacy', 60, 20, 14, 7, 12, 'Remédios, cosméticos e atendimento 24 horas.'],
+            ['Restaurante Sabor da City', 'restaurant', 100, 100, 16, 8, 14, 'Comida caseira, churrasco e culinária regional.'],
+            ['Cabeleireiro Estilo', 'salon', -60, 20, 12, 6, 10, 'Cortes, colorações e escovas com hora marcada.'],
+            ['Banco Central City10', 'bank', 140, 20, 16, 10, 14, 'Conta corrente, crédito e cooperativa da cidade.'],
+            ['Hotel City10 Palace', 'hotel', 60, 100, 20, 14, 16, 'Suítes com vista para a praça e Wi-Fi gratuito.'],
+            ['Shopping City10', 'mall', -60, 100, 26, 16, 22, 'Lojas, praça de alimentação e cinema.'],
+        ];
+        foreach ($places as [$name, $type, $px, $pz, $width, $height, $depth, $description]) {
+            Store::updateOrCreate(
+                ['name' => $name],
+                [
+                    'description' => $description,
+                    'type' => $type,
+                    'pos_x' => $px,
+                    'pos_y' => 0,
+                    'pos_z' => $pz,
+                    'width' => $width,
+                    'height' => $height,
+                    'depth' => $depth,
+                    'is_open' => true,
+                ],
+            );
+        }
+
         Mission::updateOrCreate(
             ['code' => 'exercise-5'],
             [