v1.4.4 - Fix OCR display polarity auto-detection

What's changed

Bug fixes

• Motor crop top: adjusted from 94.8% to 94.9% for more reliable row targeting
• OCR preprocessing - replace method: added avg HSV-V auto-detection; when the cropped area has a bright green background (avg V > 150), a bitwise_not is applied after the colour mask so the final image is always black text on white background (Tesseract-preferred format)
• OCR preprocessing - threshold method: automatically selects THRESH_BINARY for bright-background displays and THRESH_BINARY_INV for dark-background displays using the same avg-V heuristic

Notes

• Both Motor and RSS confirmed to use bright green background + black text — fix applies correctly to both tool types
• No changes to config file format or crop coordinates for RSS