Drop k8s-server from flake, Makefile targets, modules
(kubernetes.nix, docker-registry.nix), install script and
hardware config. Remove related registry vhost, port 6443
and NAT rules from gateway.nix. Drop K8s-Server section
and dangling markdown wrapper from README.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Replace initialPassword with hashedPassword for danlin user, move
FileBrowser admin password to external environmentFile with restricted
secrets directory, update SSH authorized key, and bump nixpkgs to 25.11.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
danlin