feat(backend): implement v2 domain slice and live smoke

backend/command-api/src/app.js

@@ -8,7 +8,7 @@ import { createCommandsRouter } from './routes/commands.js';
 
 const logger = pino({ level: process.env.LOG_LEVEL || 'info' });
 
-export function createApp() {
+export function createApp(options = {}) {
   const app = express();
 
   app.use(requestContext);
@@ -21,7 +21,7 @@ export function createApp() {
   app.use(express.json({ limit: '2mb' }));
 
   app.use(healthRouter);
-  app.use('/commands', createCommandsRouter());
+  app.use('/commands', createCommandsRouter(options.commandHandlers));
 
   app.use(notFoundHandler);
   app.use(errorHandler);