Problem (one or two sentences)

FireworksAI now supports GLM 4.6 in serverless mode. Given how good this model is for coding, it should be added to the Fireworks provider in Roo.

Context (who is affected and when)

Anyone who uses the Fireworks provider and wishes to use the GLM 4.6 model.

Desired behavior (conceptual, not technical)

GLM 4.6 should be added to the drop down list of models when the Fireworks provider is selected.

Constraints / preferences (optional)

No response

Request checklist

• I've searched existing Issues and Discussions for duplicates
• This describes a specific problem with clear context and impact

Roo Code Task Links (optional)

No response

Acceptance criteria (optional)

No response

Proposed approach (optional)

No response

Trade-offs / risks (optional)

No response