feat(notifications): P2e member self-view on /me + docs

getMyNotifications (service-client self-view, mirrors getMyBilling) +
a read-only Notifications section on /me. Docs updated in the same
change: ARCHITECTURE (Phase 2 subsystem + limitation #5), API_REFERENCE
(notifications section, fixed the stale no-auth-middleware claim),
DATABASE_SCHEMA + DB_SCHEMA_MAP (migration 041 + table), DEPLOYMENT
(env vars + dispatcher crontab), HANDOFF pass-45.

lib/actions/index.ts

@@ -68,3 +68,6 @@ export * from './presence'
 
 // Stripe recurring dues (product spine Phase 1)
 export * from './stripe'
+
+// Transactional notifications outbox (product spine Phase 2)
+export * from './notifications'