feat: member portal Sprint 8 — Member Directory

- GET /my/directory in MyService/MyController with q + interest filters
- Respects directoryVisible; excludes self; never exposes jid/phone
- q searches displayName/hometown/currentLocation (case-insensitive);
  interest filter via array `has`; aggregates top-20 interest filter chips
- BFF route forwards query string
- /my/directory page: server-rendered cards (avatar initials, location, interest tags)
- DirectorySearch client component: debounced search box + toggleable interest chips that drive URL params
- Directory nav item

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

apps/web/app/my/layout.tsx

@@ -8,6 +8,7 @@ const NAV = [
   { href: '/my/events', label: 'Events' },
   { href: '/my/seva', label: 'Seva & Points' },
   { href: '/my/circles', label: 'Circles' },
+  { href: '/my/directory', label: 'Directory' },
   { href: '/my/groups', label: 'My Groups' },
   { href: '/my/settings', label: 'Settings' },
 ];