Extract payment readers into AKSRT_Settings_Payment_Runtime and store
canonical Zibll option IDs (pay_user_vip_*, pay_balance_*, pay_box_position,
pay_mark, pay_rebate_*, pay_income_*) in aksrt_settings with no legacy
payment_* dual-read. Update PHP/JS payment schemas and VIP sidebar gate.
Make aksrt_settings the sole theme settings store for get_all(), remove
aksrt_seo_settings/aksrt_basic_settings merge paths, point global.logo
schema at aksrt_settings, and delete the retired settings migration page,
route, REST endpoint, and related SPA surface.