Add colleague setup guide and env template for Change-Detection-DEV repo.

Align production with no-login app and refresh deploy docs

Add pothole detection as new menu type with separate engine and research plan

Add landslide detection menu, separate engine, and Uttarakhand integration plan

Use manager email API for notifications (multipart/form-data); SMTP fallback

Revert Resend; use SMTP only, custom email API to be integrated later

Use Resend HTTPS API for email (HF Spaces); SMTP fallback for local

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

Rename app from SatDetect to AI Change Detection

Fix HF metadata: use valid colorTo value

Add Hugging Face Spaces support (Docker, port 7860, non-root user)

Initial commit: SatDetect satellite change detection web app