- Added image support to `OpenAIRealtimeLLMService` via `InputImageRawFrame`:
  - New `start_video_paused` parameter to control initial video input state
  - New `video_frame_detail` parameter to set image processing quality ("auto",
    "low", or "high"). This corresponds to OpenAI Realtime's `image_detail`
    parameter.
  - `set_video_input_paused()` method to pause/resume video input at runtime
  - `set_video_frame_detail()` method to adjust video frame quality dynamically
  - Automatic rate limiting (1 frame per second) to prevent API overload