Add Docker deployment health checks

[Pratikshya32]

Summary

• add a Docker image health check for the production Next.js server
• add a matching docker-compose health check for local/self-hosted deployments
• keep the existing multi-stage standalone Next.js Docker build intact

Closes #1360

Testing

• Docker build was not run in this sandbox.

[vercel]

@Pratikshya32 is attempting to deploy a commit to the PRIYANSHU DOSHI's projects Team on Vercel.

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[Priyanshu-byte-coder]

This PR now has merge conflicts with main due to recent merges. Please rebase onto the latest main branch and resolve all conflicts to proceed with merging.

[Pratikshya32]

@Priyanshu-byte-coder Thank you for the review feedback! I've noted the merge conflicts with main. I will rebase this branch onto the latest main and resolve all conflicts shortly. The core Docker health check changes (Dockerfile + docker-compose.yml) are minimal and should rebase cleanly. Will push the updated branch soon. 🔄

[Pratikshya32]

@Priyanshu-byte-coder I have fully resolved the merge conflicts and rebased the branch onto the latest main. The massive file diff was fixed and the PR now cleanly contains just the requested Docker health check additions (Dockerfile + docker-compose). This is resolved and ready for a final review/merge! 🚀