fix and update kube manifests for v7

[crocinsocks]

🧩 Summary

The Kubernetes manifests in this repository were significantly out of date, lacked structure, and offered little guidance for deployment. This pull request modernizes and reorganizes them to make self-hosting Huly easier and more maintainable.

💡 Motivation

I recently discovered this project and wanted to self-host it. While doing so, I realized that the existing Kubernetes setup required a lot of reverse-engineering and manual trial and error — much of which could be avoided with clearer manifests and documentation.

This PR aims to:

• Bring the Kubernetes manifests up to date and aligned with the current platform architecture.
• Provide a clear and maintainable structure under kube/.
• Improve readability and consistency across deployments and services.
• Help new contributors and self-hosters get started faster.

🛠️ Changes

• Reorganized and updated all manifests under kube/
• Added a high-level README.md explaining prerequisites, service architecture, and routing
• Introduced a structured layout for each service (deployment + service)
• Cleaned up and validated references to Redpanda, CockroachDB, and MinIO
• Added an example HTTPRoute definition for Gateway API routing
• Removed deprecated or redundant configuration patterns

🧾 Notes

These changes are based on a recent successful self-hosted deployment.
I’ve included comments and sensible defaults that should make local and test deployments much easier to bootstrap.

🧩 Related Issues

Fixes #181

🙏 Acknowledgment

I really appreciate the effort the team has put into building this project.
This PR is intended as a contribution back to the community — to help others understand the platform internals and deploy it more easily.

[huly-github-staging]

Connected to Huly®: SELFH-213