feat(deploy): add dedicated Coolify deployment package

[mrbeandev]

Summary

• add a dedicated Coolify deployment package with Dockerfile.coolify, docker-compose-coolify.yml, and entrypoint-coolify.sh
• add standalone Coolify deployment documentation in COOLIFY.md
• add a concise README section that links to the detailed Coolify deployment guide

Why

• this splits deployment infrastructure out from channel/runtime work so each PR is easier to review and maintain
• operators who deploy with Coolify get a copy/paste-friendly path without affecting default Docker/CLI flows

Scope

• deployment/docs only (no provider, tool, or channel runtime logic changes)