Rebrand the project as Tinyforge to reflect its evolution from a Docker
container watcher into a self-hosted mini CI/deployment platform.
Rename covers: Go module path, Docker labels, DB/config filenames,
JWT issuer, Dockerfile binary, docker-compose, CI workflows, frontend
i18n, README with static sites docs, and all code comments.
- CRITICAL: Change DNS zones endpoint from GET to POST to avoid
leaking API token in URL query parameters
- HIGH: Add sync.RWMutex to protect dnsProvider field in Server,
Deployer, and proxy Manager against concurrent read/write races
- HIGH: Capture old DNS provider reference synchronously before
launching background cleanup goroutine
- HIGH: Use getDNS()/getDNSProviderLocked() accessors instead of
direct field reads in all DNS operations