fix: nginx dns re-resolve, db healthcheck, explicit bind

apps/api/src/main.ts

@@ -10,6 +10,7 @@ async function bootstrap() {
   app.useGlobalPipes(new ValidationPipe({ whitelist: true, transform: true }));
   app.useGlobalFilters(new PrismaExceptionFilter());
   app.enableCors();
-  await app.listen(process.env.PORT ?? 3000);
+  // Bind all interfaces explicitly so the container is reachable from nginx.
+  await app.listen(process.env.PORT ?? 3000, '0.0.0.0');
 }
 bootstrap();