feat: member portal Sprint 3 — profile edit form and privacy center

- PATCH /my/profile API endpoint (displayName, hometown, currentLocation, interests, language, digestPreference, directoryVisible)
- BFF PATCH /api/my/profile route
- ProfileForm client component: interest chips, digest preference, language, directory toggle
- Settings page rewrite: profile edit + privacy center (consent list + opt-out) + session + account delete

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/app/api/my/profile/route.ts

@@ -7,3 +7,14 @@ export async function GET(): Promise<Response> {
   const body = await res.json();
   return jsonResponse(body, res.status);
 }
+
+export async function PATCH(request: Request): Promise<Response> {
+  const body = await request.json();
+  const res = await memberApiFetch('/my/profile', {
+    method: 'PATCH',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(body),
+  });
+  const resBody = await res.json();
+  return jsonResponse(resBody, res.status);
+}