feat: add ROI selection from web UI - #12
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Allow users to select, reselect, or clear the motion detection region of interest directly from the web UI by drawing on the live stream. - Add thread-safe get_roi/set_roi to FrameBuffer - Add POST /roi endpoint with validation, extend GET /status with roi - Add canvas-based ROI drawing overlay with mouse+touch support - Handle object-fit:cover coordinate mapping (CSS to frame pixels) - Detection loop reads ROI from FrameBuffer each iteration - 70 tests passing (8 new)
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Summary
POST /roi, detection loop picks up changes each frame via thread-safe FrameBufferobject-fit: coverscalingTest plan