feat: add vLLM/local LLM support

- Add vllm provider configuration in config schema
- Auto-detect vLLM endpoints and use hosted_vllm/ prefix for LiteLLM
- Pass api_base directly to acompletion for custom endpoints
- Add vLLM status display in CLI status command
- Add vLLM setup documentation in README

nanobot/cli/commands.py

@@ -624,10 +624,13 @@ def status():
         has_openrouter = bool(config.providers.openrouter.api_key)
         has_anthropic = bool(config.providers.anthropic.api_key)
         has_openai = bool(config.providers.openai.api_key)
+        has_vllm = bool(config.providers.vllm.api_base)
         
         console.print(f"OpenRouter API: {'[green]✓[/green]' if has_openrouter else '[dim]not set[/dim]'}")
         console.print(f"Anthropic API: {'[green]✓[/green]' if has_anthropic else '[dim]not set[/dim]'}")
         console.print(f"OpenAI API: {'[green]✓[/green]' if has_openai else '[dim]not set[/dim]'}")
+        vllm_status = f"[green]✓ {config.providers.vllm.api_base}[/green]" if has_vllm else "[dim]not set[/dim]"
+        console.print(f"vLLM/Local: {vllm_status}")
 
 
 if __name__ == "__main__":