fix: [permission] Role::users() 반환 타입 선언 추가

- Spatie Role::users(): BelongsToMany 시그니처와 호환되도록 수정
- FatalError: Declaration must be compatible 에러 해결

app/Models/Permissions/Role.php

@@ -8,6 +8,7 @@
 use App\Models\Tenants\Tenant;
 use App\Traits\Auditable;
 use App\Traits\BelongsToTenant;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\SoftDeletes;
 use Spatie\Permission\Models\Role as SpatieRole;
 
@@ -53,7 +54,7 @@ public function userRoles()
     /**
      * 관계: 사용자 (user_roles 테이블 통해)
      */
-    public function users()
+    public function users(): BelongsToMany
     {
         return $this->belongsToMany(
             User::class,