Setup OpenCode and Claude for spacebot container (flakes-pr3i)

Configure OpenCode with the claude-code-plugin (github:unixfox/opencode-claude-code-plugin) in the spacebot incus container, enabling Claude as a coding assistant within spacebot’s environment.

Summary of Changes

• Added opencode-claude-code-plugin flake input (github:unixfox/opencode-claude-code-plugin, flake=false)
• Updated mixins/home/containers/spacebot.nix:
  • Added llm-agents.opencode and llm-agents.claude-code to packages
  • Added xdg.configFile."opencode/plugins/claude-code" pointing to plugin source
• Plugin placed at ~/.config/opencode/plugins/claude-code for OpenCode to load
• Also fixed minor bug in spacebot-restart (was calling spacebot-restart instead of spacebot-status)