551e9b2cb4
Enable Opencode and Ollama in home modules and import their Nix files. Disable the deprecated system‑module opencode entries and remove it from the core packages list. Add a new GitHub CLI module and a convenient `upf-gh` alias for flake updates using a GitHub token. Update the `stylix` configuration to include Opencode styling. Refresh several flake.lock entries with newer revisions and hashes.