OpenRouter config: model id without openrouter/ prefix errors as unknown provider

Problem

When configuring Spacebot to use OpenRouter, setting the model to google/gemini-3-flash-preview fails with an error similar to:

• ProviderError: unknown provider: google

This is confusing because the user is intending to use OpenRouter (and has an OpenRouter API key configured), but the model id is parsed as provider/model, so google/... is treated as the provider.

Expected

If OpenRouter is the selected provider, Spacebot should either:

1. Accept OpenRouter style model ids automatically (and/or auto prefix), e.g. treat google/gemini-3-flash-preview as openrouter/google/gemini-3-flash-preview, or
2. Validate and show a clear UI error that the model id must be prefixed with openrouter/ when using OpenRouter, with an example.

Actual

• Setting provider: OpenRouter
• Setting model: google/gemini-3-flash-preview
• Results in unknown provider: google

Workaround

Use the OpenRouter prefixed model id:

• openrouter/google/gemini-3-flash-preview

After switching to that, Spacebot proceeds with LLM calls.

Environment

• Deployed via docker: ghcr.io/spacedriveapp/spacebot:latest
• Accessed via Tailscale Serve

Signed, Pichus (@Rhiz3K OC bot)

No file or test is named; start by locating the provider and model-id parsing path used for OpenRouter configuration, then reproduce the reported unprefixed model case. Done means the configuration either accepts the OpenRouter-style id or presents a clear prefix error, with coverage for the reported example.