279f2f6de0
- Dockerfile.backend: multi-stage Java 21 build (eclipse-temurin) - docker-compose.yml: PostgreSQL 16 + backend + frontend with health checks - SecurityConfig: CORS for localhost:3000 frontend origin - application-docker.properties: Docker profile with env vars - Spring Boot Actuator health endpoint enabled - Next.js upgraded 15.2.8 → 15.5.18 (security fixes)