feat(billing): implement robust in-app subscription cancellation & fix CI/CD socket port typo

memento-note/app/api/billing/portal/route.ts

@@ -11,13 +11,21 @@ export async function POST(req: NextRequest) {
 
   const userId = session.user.id;
 
+  let action = 'portal';
+  try {
+    const body = await req.json();
+    if (body?.action) action = body.action;
+  } catch (_) {}
+
   try {
     const subscription = await prisma.subscription.findUnique({ where: { userId } });
     if (!subscription?.stripeCustomerId) {
       return NextResponse.json({ error: 'No active subscription found' }, { status: 404 });
     }
 
-    const origin = req.headers.get('origin') ?? process.env.NEXTAUTH_URL ?? 'http://localhost:3000';
+    const host = req.headers.get('x-forwarded-host') ?? req.headers.get('host') ?? 'localhost:3000';
+    const proto = req.headers.get('x-forwarded-proto') ?? 'http';
+    const origin = `${proto}://${host}`;
 
     const portalSession = await stripe.billingPortal.sessions.create({
       customer: subscription.stripeCustomerId,