feat(vehicle): dedicated photo upload with MediaLibrary + form field

Vehicle model now implements HasMedia + InteractsWithMedia and
registers a 'photos' collection. VehicleResource form gets a
SpatieMediaLibraryFileUpload section (collapsible, max 6 photos,
imageEditor enabled).

Dashboard already checks vehicle->getFirstMediaUrl('photos') first
and falls back to the WO's photos, so uploading here immediately
populates the vehicle card on the dashboard without any view changes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/Models/Tenant/Vehicle.php

@@ -7,10 +7,12 @@ use App\Models\Concerns\Auditable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\SoftDeletes;
+use Spatie\MediaLibrary\HasMedia;
+use Spatie\MediaLibrary\InteractsWithMedia;
 
-class Vehicle extends Model
+class Vehicle extends Model implements HasMedia
 {
-    use Auditable, BelongsToTenant, SoftDeletes;
+    use Auditable, BelongsToTenant, InteractsWithMedia, SoftDeletes;
 
     public const BODY_TYPES = [
         'sedan' => 'Sedan', 'hatchback' => 'Hatchback', 'suv' => 'SUV',
@@ -44,4 +46,9 @@ class Vehicle extends Model
     {
         return trim("{$this->make} {$this->model} " . ($this->year ?: ''));
     }
+
+    public function registerMediaCollections(): void
+    {
+        $this->addMediaCollection('photos');
+    }
 }