feat: add V4L2 camera support#1
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Keep AX_VIDEO_FRAME_T::u32PicStride as bytes-per-line for packed RGB/BGR; AX650 IVPS expects byte stride (fixes corrupted NV12->BGR preprocess). Also avoid VPP CSC for packed RGB/BGR and stage geometry+format conversion: CropResize (same format) then CSC via TDP, reusing an intermediate CMM buffer to reduce allocs.
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CameraPipeline支持 V4L2 摄像头输入ax_camera_pipeline.h/cpp(679 lines)ax_v4l2_capture.h/cpp(739 lines)CMakeLists.txt包含 camera pipeline主要功能