justsisyphus e180d295bb feat(installer): add GitHub Copilot fallback for visual/frontend agents
- frontend-ui-ux-engineer, document-writer, multimodal-looker, explore
  now use Copilot models when no native providers available
- Category overrides (visual-engineering, artistry, writing) also use
  Copilot models as fallback
- Priority: native providers (Gemini/Claude) > Copilot > free models
- Login guide moved to bottom with GitHub Copilot auth option added

🤖 Generated with [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode) assistance
2026-01-14 19:11:28 +09:00
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