Bump version to 2.1.0, add version+IST time to /health for deploy verification

Convert timestamps to IST server-side so display is correct regardless of browser cache

Fix history timestamps: append UTC offset so browser converts to local time

Full codebase audit: fix critical perf bug, security, error handling, dead code

Save full-res before image so the before/after slider works from history View

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

HF fix: uvicorn-only CMD, defensive mkdir, remove unused numpy, overlay mkdir on save, README troubleshooting

Fix HF restart loop: /health endpoint, resilient migration, lazy-load detection_engine

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

Add email notification feature with Notify checkbox, SMTP backend, and HTML template

Add Delhi zone/village dropdowns, location tracking, and project documentation

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

Add forgot password flow and password visibility toggle

Add detailed error logging to register/login endpoints

Fix: writable data dir for HF Spaces, pin bcrypt 4.0.1

Fix: add checkfirst=True for table creation, use 1 worker

Initial commit: SatDetect satellite change detection web app