Default all day-to-day work to gallery_dev and devgallery; add Cursor rule and update docs, env examples, and deploy guide for scheduled prod promotion.
Split PostgreSQL into gallery_dev and gallery_prod, add Docker/Gitea deploy tooling, SMB image sync, pgAdmin split script, dev:web on Keenetic :5173, and operator docs. Co-authored-by: Cursor <cursoragent@cursor.com>