Allow pay_no_logged_in cash content orders (user_id=0), set aksrt_pay_* cookies
on paid, accept cookie in access state, and expose guest CTA on paywall/box.
Bump content sales on resource order paid; show order number/time in download
box; poll pending gateway payments; support download_limit_over_price overbuy.
Rewrite captcha core around aksrt_captcha_config only, require captcha
on login/comment/SMS/phone auth and related gates, wire frontend token
collection, and remove dead dual-source security settings plus slider enqueue.
kate522