Use text input for provider model types

[fengju0213]

Why

OrcaRouter and Nebius Token Factory rendered the model type field as a model-list combobox because they declared a models endpoint. That made their configuration UI look and behave differently from the other provider cards.

What Changed

• Removed the model-list endpoint metadata from OrcaRouter and Nebius Token Factory.
• Both providers now use the same freeform Model Type input as the other provider configurations.

Validated with npx eslint src/lib/llm.ts --no-warn-ignored and npm run type-check.

[4pmtong]

I’ll close this PR. This change isn’t necessary: once the API key is entered, the model list can be fetched and used normally.