Prevent zero-sized letterbox resizes

[parkjinman98]

Motivation

• Floor-mode letterboxing could truncate a highly asymmetric source axis to zero, causing cv2.resize to raise an exception and enabling a low-severity denial-of-service when unhandled.
• The change aims to preserve upstream "floor" semantics while ensuring downstream preprocessing never requests an empty resize dimension.

Description

• Clamp computed resized dimensions in LetterBoxGeometry.from_shapes so resized_height and resized_width are at least 1 while keeping existing rounding/truncation behavior otherwise. This prevents zero-sized resize targets from reaching OpenCV.
• Add regression tests in tests/test_yolox_damoyolo.py that exercise extremely wide and extremely tall inputs through the packaged YOLOX and DAMO-YOLO preprocessing configurations to ensure the short axis remains nonzero for size_rounding="floor".

Testing

• Ran the package YOLOX/DAMO-YOLO tests with OpenCV GL stub: LD_LIBRARY_PATH=/tmp/fake-gl python -m pytest -q tests/test_yolox_damoyolo.py, resulting in 94 passed (all tests in that file).
• Ran the specific floor-rounding subset: LD_LIBRARY_PATH=/tmp/fake-gl python -m pytest -q tests/test_yolox_damoyolo.py -k 'floor_rounding', resulting in 5 passed for the focused cases.
• Note: the environment lacks libGL.so.1 so tests used a temporary no-op GL loader under /tmp/fake-gl; pre-commit was not available in the execution environment.

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