feat: implement auth system, passkeys, and user management

Add PostgreSQL and Redis integration for users and sessions
Implement password and WebAuthn passkey login flows
Add Docker stack, super-admin seeding, and protected routes

.env.example

@@ -0,0 +1,9 @@
+NUXT_DATABASE_URL=postgresql://postgres:postgres@127.0.0.1:5432/dinner_ticket_system
+NUXT_REDIS_URL=redis://127.0.0.1:6379
+NUXT_SESSION_COOKIE_NAME=dinner_ticket_session
+
+# Use your deployed HTTPS origin in production so WebAuthn/passkeys validate correctly.
+NUXT_PUBLIC_APP_URL=http://localhost:20013
+NUXT_PUBLIC_RP_NAME=Dinner Ticket System
+NITRO_HOST=0.0.0.0
+PORT=20013