Merge Flask GET/POST routes, refresh prefs on tab revisit after preload, and reorganize system settings into separate cards.
Co-authored-by: Cursor <cursoragent@cursor.com>
P1-P4: configurable nav/section visibility in system settings, full .env editor with restart badges, password change, runtime hot overrides, and single-instance pm2 restart. Works in hub embed iframe.
Co-authored-by: Cursor <cursoragent@cursor.com>