feat: member portal Sprint 1 — dashboard with MemberShell layout and TowerUser profile fields

- Add avatar, hometown, currentLocation, interests, language, digestPreference, directoryVisible fields to TowerUser
- Migration: 20260617200000_add_tower_user_profile_fields
- GET /my/dashboard API endpoint with stats (groups, messages, consents)
- BFF route /api/my/dashboard
- MemberShell 3-column layout (220px nav + flex-1 main + 280px rail)
- Dashboard page: hero card, stat cards, group list, interests chips
- Sidebar returns null for /my paths (MemberShell owns the nav)

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

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

@@ -0,0 +1,9 @@
+import { jsonResponse, memberApiFetch } from '../../../_lib/api';
+
+export const dynamic = 'force-dynamic';
+
+export async function GET(): Promise<Response> {
+  const res = await memberApiFetch('/my/dashboard');
+  const body = await res.json();
+  return jsonResponse(body, res.status);
+}