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/health.get.ts

@@ -0,0 +1,23 @@
+import { ensureDatabaseReady } from '../utils/db-init'
+import { getRedisClient } from '../utils/redis'
+import { getSqlClient } from '../utils/postgres'
+
+export default defineEventHandler(async () => {
+  await ensureDatabaseReady()
+
+  const sql = getSqlClient()
+  await sql`select 1`
+
+  const redis = await getRedisClient()
+  await redis.ping()
+
+  return {
+    ok: true,
+    services: {
+      app: 'up',
+      postgres: 'up',
+      redis: 'up'
+    },
+    timestamp: new Date().toISOString()
+  }
+})