Allow access to health and root endpoints.

Update Dockerfile to use Temurin 21 and new JAR name.

Update Dockerfile with Temurin 21 and new JAR name.

Update Dockerfile to use multi-stage build and new JAR name.

Update production port to use environment variable.

Update base Docker image to eclipse-temurin:17-jdk-jammy.

Add JWT authentication, Swagger UI, and Docker support.

initialized