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.

tests/Feature/CityActionsTest.php

@@ -9,6 +9,7 @@ use App\Models\Job;
 use App\Models\Transaction;
 use App\Models\User;
 use App\Support\Beach;
+use App\Support\Port;
 use Database\Seeders\CityWorldSeeder;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Tests\TestCase;
@@ -58,7 +59,8 @@ class CityActionsTest extends TestCase
 
     /**
      * Position updates clamp to the beach shoreline (past the road grid)
-     * and persist; other axes clamp to the city bounds.
+     * and persist; Z clamps to the port strip (opened for x >= 150, the
+     * north-east port/coast) or to the city bounds otherwise.
      */
     public function test_position_persists_and_clamps(): void
     {
@@ -67,8 +69,10 @@ class CityActionsTest extends TestCase
 
         $this->character->refresh();
         $city = $this->character->city;
+        // Clamped X lands on the shoreline/quay band (>= VISIT_MIN_X), so
+        // the deep north coast (port strip) is reachable.
         $this->assertSame(Beach::sandTo($city) + 2, $this->character->pos_x);
-        $this->assertSame((float) $city->bounds_min_z, $this->character->pos_z);
+        $this->assertSame(Port::VISIT_MIN_Z, $this->character->pos_z);
     }
 
     /**