debug: add error logging to railway start command

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: junzero741

railway.toml

@@ -2,5 +2,5 @@
 dockerfilePath = "apps/backend/Dockerfile"
 
 [deploy]
-startCommand = "npx prisma migrate deploy && node main.js"
+startCommand = "npx prisma migrate deploy && node -e \"try { require('./main.js') } catch(e) { console.error(e); process.exit(1) }\""
 restartPolicyType = "ON_FAILURE"