rotato: zero-dependency node proxy that rotates LLM API keys on 429

Running multiple LLM providers - openai, gemini, groq, openrouter - and constantly hitting rate limits is annoying. i built rotato to solve exactly that. it's a node.js proxy server that sits in front of your LLM API calls. when a 429 hits, it rotates to the next available key automatically. zero restarts, zero manual intervention, zero external npm dependencies. what it does point your existing code at localhost:8990/your-provider/ instead of the real API endpoint.