- Added image support to `OpenAIRealtimeLLMService` via `InputImageRawFrame`:
  - New `start_image_paused` parameter to control initial image input state
  - New `image_detail` parameter to set image processing quality ("auto", "low", or "high")
  - `set_image_input_paused()` method to pause/resume image input at runtime
  - `set_image_detail()` method to adjust image quality dynamically
  - Automatic rate limiting (1 image per second) to prevent API overload