feat(api): add root healthcheck for huggingface proxy

apps/api/src/index.ts

@@ -18,6 +18,10 @@ server.register(adminRoutes, { prefix: '/v1/admin' });
 import { aiRoutes } from './routes/ai';
 server.register(aiRoutes, { prefix: '/v1/ai' });
 
+server.get('/', async (_req, reply) => {
+    return reply.code(200).type('application/json').send({ ok: true });
+});
+
 server.get('/health', async () => {
     return { status: 'ok', timestamp: new Date().toISOString() };
 });