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/api/src/modules/my/my.controller.ts

@@ -24,6 +24,11 @@ class OptInDto {
 export class MyController {
   constructor(private readonly service: MyService) {}
 
+  @Get('dashboard')
+  dashboard(@CurrentMember() member: MemberJwtPayload) {
+    return this.service.getDashboard(member.sub, member.tenantId);
+  }
+
   @Get('profile')
   profile(@CurrentMember() member: MemberJwtPayload) {
     return this.service.getProfile(member.sub, member.tenantId);