Improve detection accuracy: border exclusion, threshold floors, fill-ratio filter, NMS, tighter bboxes

History table view, zoom, severity markers, row hover highlight, before/after thumbnails

Add vegetation and structural sub-classification for detected changes

Add 3D building analysis: shadow-based height/stories estimation and construction stage classification

Code review fixes: SSIM stability, symmetric CLAHE, confidence scoring, KMeans perf, auth hardening, remove debug endpoint

Initial commit: SatDetect satellite change detection web app