feat: add LM Studio headless LMS server module

- Custom NixOS module wrapping the lms CLI (daemon + server)
- Supports auto-loading models on startup
- Optional nginx reverse proxy via domain option
- Security hardening (NoNewPrivileges, ProtectSystem, PrivateTmp)
- Follows existing myModules.* convention
- Enabled on this host on port 1234 (no models loaded yet)

modules/default.nix

@@ -13,5 +13,6 @@
     ./forgejo.nix
     ./headscale.nix
     ./open-webui.nix
+    ./lmstudio-server.nix
   ];
 }