Rename to nix-config, terminology cleanup

- Rename repo: nixos-iscg -> nix-config (forgejo)
- Update description for future darwin host (poppy)
- Update README, flake.nix description
- Fix references in hosts/muscari comments

README.md

@@ -1,3 +1,3 @@
-# nixos-iscg
+# nix-config
 
-NixOS configurations for iscg infra hosts (muscari k3s + future rosemary backup)
+Nix configurations for iscg infra hosts (muscari k3s + future rosemary backup + future poppy darwin)

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "iscg NixOS configurations (muscari k3s + future rosemary backup)";
+  description = "Nix configurations for iscg infra hosts (muscari k3s + future rosemary backup + future poppy darwin)";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";

hosts/muscari/default.nix

@@ -1,5 +1,5 @@
-# muscari — k3s single-node cluster на YC (Debian 12 → NixOS через nixos-anywhere)
-# https://git.iscg.dev/mikl/nixos-iscg
+# muscari — k3s single-node cluster на YC (Debian 12 → Nix через nixos-anywhere)
+# https://git.iscg.dev/mikl/nix-config
 
 { config, pkgs, lib, ... }:
 {

hosts/muscari/hardware-configuration.nix

@@ -1,6 +1,6 @@
 # Hardware configuration для muscari (Yandex Cloud VM)
 # PLACEHOLDER — будет заменён реальным после создания VM в YC
-# (см. ../NIXOS-SETUP.md, шаг 4-5)
+# (см. ../k3s/NIXOS-SETUP.md, шаг 4-5)
 
 # Временный placeholder чтобы flake.nix компилировался
 # После создания VM в YC с Debian 12: