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

server/api/admin/users.get.ts

@@ -0,0 +1,10 @@
+import { requireRole } from '../../utils/auth'
+import { listUsers } from '../../utils/user-repository'
+
+export default defineEventHandler(async (event) => {
+  await requireRole(event, 'super_admin')
+
+  return {
+    users: await listUsers()
+  }
+})