Quotio is a local OpenAI-compatible proxy that routes to various AI models
(Claude via Gemini credits, etc.). This adds it as a first-class provider
option in the onboarding wizard, eliminating the need for manual config edits.
- Add 'quotio' to AuthChoice type
- Add Quotio group to provider options
- Create dedicated handler with URL/API key prompts
- Configure provider with Claude Opus 4.5, Sonnet 4, Gemini 3 Flash models
- Use openai-completions API for compatibility
