feat(api,userbot,frontend): add accounts from the web ui and isolate per-account settings

docker-compose.yml

@@ -52,6 +52,7 @@ services:
     restart: unless-stopped
     volumes:
       - ./backend/src:/app/src
+      - ./backend/sessions:/app/sessions
       - ./frontend/build:/app/static:ro
       - ${STORAGE__ROOT:-./storage}:/app/storage
     depends_on: