Refactor code structure and remove redundant sections for improved readability and maintainability

backend/services/authService.js

@@ -65,7 +65,7 @@ const activateUser = async (activationCode) => {
   return user;
 };
 
-const login = async (email, password) => {
+const login = async (email, password, options = {}) => {
   if (!email || !password) {
     const err = new Error('Email und Passwort sind erforderlich.');
     err.status = 400;
@@ -83,13 +83,17 @@ const login = async (email, password) => {
     err.status = 403;
     throw err;
   }
-  const token = jwt.sign({ userId: user.id }, process.env.JWT_SECRET, { expiresIn: '3h' });
+  const rememberMe = Boolean(options.rememberMe);
+  const expiresInMs = rememberMe ? 90 * 24 * 3600 * 1000 : 3 * 3600 * 1000;
+  const expiresIn = rememberMe ? '90d' : '3h';
+  const expiresAt = new Date(Date.now() + expiresInMs);
+  const token = jwt.sign({ userId: user.id }, process.env.JWT_SECRET, { expiresIn });
   await UserToken.create({
     userId: user.id,
     token,
-    expiresAt: new Date(Date.now() + 3 * 3600 * 1000),
+    expiresAt,
   });
-  return { token };
+  return { token, expiresAt: expiresAt.toISOString() };
 };
 
 const logout = async (token) => {