feat: add Gemini provider support

- Update configuration schema to include Gemini provider
- Modify API key retrieval priority to include Gemini
- Enhance CLI status command to display Gemini API status
- Update LiteLLMProvider to support Gemini integration

nanobot/cli/commands.py

@@ -624,11 +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_gemini = bool(config.providers.gemini.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]'}")
+        console.print(f"Gemini API: {'[green]✓[/green]' if has_gemini 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}")