Add egocentric rotation support to centroid cropping inference

Extends centroid cropping with optional orientation-based rotation during inference. Images and keypoints are rotated to align orientation anchor points along the positive x-axis before cropping, then predictions are inverse-rotated back to original orientation.

Key changes:
- Add orientation_anchor_parts parameter to inference pipeline
- Apply egocentric rotation per instance in CentroidCrop
- Store rotation angles and apply inverse rotation in FindInstancePeaks
- Fix coordinate transformation from crop to full image space

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Co-Authored-By: Claude <[email protected]>

Author: gitttt-1234