refactor: use michaotic username throughout, add cli/kitty/zsh configs and docs

docs/muscari.md

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+# muscari
+
+NixOS server on Yandex Cloud. k3s single-node cluster.
+
+## specs
+
+- VM: 2 vCPU / 8 GB RAM / 64 GB SSD
+- IP: 158.160.166.30
+- Network: Legacy BIOS (no EFI)
+
+## quick rebuild
+
+```bash
+sudo nixos-rebuild switch --flake .#muscari
+```
+
+## imports
+
+- `disk-config.nix` - disko partitioning
+- `k3s.nix` - kubernetes cluster setup
+- `hosts/common/` - shared nixos settings
+
+## networking
+
+open ports:
+- 22 - ssh
+- 80 - http (traefik ingress)
+- 443 - https (traefik ingress)
+
+6443 is closed - kubectl via ssh tunnel only.
+
+## ssh keys
+
+fetched from `https://git.iscg.dev/mikl.keys` with sha256 pinning.
+
+## TODO
+
+- [ ] k8s aliases (k, kx, kl, kd, etc)
+- [ ] add nix-specific aliases (switch, update, cleanup with sudo)