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+- Fixed `GrokRealtimeLLMService` ignoring the configured model. The model was stored in `Settings` but never sent to xAI, so every session silently fell back to the deprecated `grok-voice-fast-1.0`. The model is now passed via the `?model=` query parameter on the WebSocket URL as xAI's Voice Agent API requires, and the default has been updated to the recommended `grok-voice-think-fast-1.0`.