Add patient personalization: profile saved once, reused every chat turn

apps/web/app/profile/page.tsx

@@ -0,0 +1,11 @@
+import { ProfileForm } from "../_components/ProfileForm";
+
+/**
+ * Only reachable by a logged-in account (linked from `AccountMenu`, never
+ * shown to an anonymous visitor). Saving a profile here is what lets the
+ * chat composer stop asking age/weight every turn for that account — see
+ * `ChatPanel.tsx`'s use of `getPatientProfile`.
+ */
+export default function ProfilePage() {
+  return <ProfileForm />;
+}