Fix import error in api.py

- Added login_required decorator definition in api.py to fix NameError

vidai/api.py

@@ -42,6 +42,17 @@ def get_current_user_session():
         return get_current_user(session_id)
     return None
 
+def login_required(f):
+    """Decorator to require login."""
+    def decorated_function(*args, **kwargs):
+        user = get_current_user_session()
+        if not user:
+            from flask import redirect, url_for
+            return redirect(url_for('login'))
+        return f(*args, **kwargs)
+    decorated_function.__name__ = f.__name__
+    return decorated_function
+
 def api_auth_required(f):
     """Decorator to require authentication via session or API token."""
     def decorated_function(*args, **kwargs):