feat: add support for backward compatibility flags in templates

Author: AshishKumar4

worker/services/sandbox/sandboxSdkClient.ts

@@ -591,7 +591,7 @@ export class SandboxSdkClient extends BaseSandboxService {
         try {
             // Use CLI tools for enhanced monitoring instead of direct process start
             const process = await this.getSandbox().startProcess(
-                `monitor-cli process start --instance-id ${instanceId} --port ${port} -- bun run dev`, 
+                `VITE_LOGGER_TYPE=json monitor-cli process start --instance-id ${instanceId} --port ${port} -- bun run dev`, 
                 { cwd: instanceId }
             );
             this.logger.info('Development server started', { instanceId, processId: process.id });