Update admin.py decorators

- Changed all @require_admin to @admin_required in admin.py
- Now uses the decorator from utils.py instead of auth.py

vidai/admin.py

@@ -69,7 +69,7 @@ def get_result(msg_id: str) -> dict:
 
 
 @admin_bp.route('/train', methods=['GET', 'POST'])
-@require_admin
+@admin_required
 def train():
     user = get_current_user_session()
     message = None
@@ -138,7 +138,7 @@ def train():
                             active_page='train')
 
 @admin_bp.route('/users')
-@require_admin
+@admin_required
 def users():
     """Admin panel for user management."""
     users = get_all_users()
@@ -146,7 +146,7 @@ def users():
     return render_template('admin/users.html', users=users, user=user, active_page='admin')
 
 @admin_bp.route('/users/create', methods=['POST'])
-@require_admin
+@admin_required
 def admin_create_user():
     """Create a new user via admin panel."""
     from .auth import create_user