Move model observers onto attributes and tidy provider bindings.

Register observers with ObservedBy, bind the comment spam classifier, and keep AppServiceProvider focused on application wiring.

app/Models/ArtworkAward.php

@@ -4,9 +4,12 @@ declare(strict_types=1);
 
 namespace App\Models;
 
+use App\Observers\ArtworkAwardObserver;
+use Illuminate\Database\Eloquent\Attributes\ObservedBy;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
+#[ObservedBy([ArtworkAwardObserver::class])]
 class ArtworkAward extends Model
 {
     protected $table = 'artwork_medals';
@@ -21,21 +24,21 @@ class ArtworkAward extends Model
 
     protected $casts = [
         'artwork_id' => 'integer',
-        'user_id'    => 'integer',
-        'weight'     => 'integer',
+        'user_id' => 'integer',
+        'weight' => 'integer',
     ];
 
     public const MEDALS = ['gold', 'silver', 'bronze'];
 
     public const WEIGHTS = [
-        'gold'   => 5,
+        'gold' => 5,
         'silver' => 3,
         'bronze' => 1,
     ];
 
     public static function weightFor(string $medal): int
     {
-        return (int) config('artwork_medals.weights.' . $medal, self::WEIGHTS[$medal] ?? 0);
+        return (int) config('artwork_medals.weights.'.$medal, self::WEIGHTS[$medal] ?? 0);
     }
 
     /**