feat: implement core functionality for camera preview application
- Add FrameDispatcher for distributing QVideoFrames to subscribers - Implement TelemetryCollector to measure video pipeline performance metrics - Create MainWindow as the main application interface with video rendering - Develop AppMenuBar for camera selection, resolution, and FPS settings - Establish overlay system for displaying telemetry metrics - Set up project structure and configuration files - Add unit tests for FrameDispatcher and TelemetryCollector
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