feat(port): add sea port with quay, terminal, berths, and AI port master

Adds a new port district on the north-east coast with walkable quay, container yard, terminal, gantry cranes, and berths. Includes AI-driven port master (Capitão do Porto) and dock workers for ship dispatch, plus full frontend rendering of ships, boats, and trucks.

app/Http/Controllers/Web/CityActionController.php

@@ -13,6 +13,7 @@ use App\Support\Airports;
 use App\Support\Beach;
 use App\Support\CityPlazas;
 use App\Support\MissionTracker;
+use App\Support\Port;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\DB;
@@ -62,6 +63,11 @@ class CityActionController extends Controller
             $minZ = Airports::VISIT_MIN_Z;
             $maxZ = Airports::VISIT_MAX_Z;
         }
+        // Port strip (north-east coast): walking east of the bounds opens
+        // the Z range down to the port grounds/quay.
+        if ($x >= Port::VISIT_MIN_X) {
+            $minZ = Port::VISIT_MIN_Z;
+        }
         $z = max($minZ, min($maxZ, (float) $data['pos_z']));
 
         $character->forceFill([