luochen570 d9b2204f19 refactor: move optional modules to modules/optional/ ...

- Move virtualbox-guest.nix and vscode-server.nix from modules/server/ to modules/optional/
- Create modules/optional/README.md with usage docs
- Update profiles/virtualbox.nix and profiles/wsl.nix import paths
- Update modules/server/README.md to reflect removal
- Update root README.md directory tree with optional/ entry

2026-05-26 13:15:58 +08:00

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