fix(GRO-816): remove unused 'now' variable from portal.ts appointments handler

The PR refactored appointments response from { upcoming, past } to
{ appointments: [] } but the `now` variable used to compute those
filters was left behind. ESLint correctly flags it as unused.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/routes/portal.ts

@@ -102,7 +102,6 @@ portalRouter.get("/appointments", async (c) => {
   const db = getDb();
   const clientId = c.get("portalClientId");
 
-  const now = new Date();
   const allAppts = await db
     .select({
       id: appointments.id,