Add HEALTHCHECK instruction to Dockerfile

[adnaan]

Context

This follow-up task was identified during the review of PR #132.

Source PR: #132
PR Title: feat: add Docker support with multi-stage build
Suggested by: @claude[bot]

Task Description

For production deployments, consider adding a HEALTHCHECK instruction to the Dockerfile.

This would require adding wget or curl to the final stage (adds ~1MB to image size).

Example:

RUN apk add --no-cache wget
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1

Considerations

• Adds ~1MB to image size
• Requires /health endpoint to exist
• Useful for orchestration (Docker Compose, Kubernetes)

---

This issue was automatically created from PR review comments.