Ilia Denisov
1507ceb793
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Let an operator disable purchases live from the admin — a whole rail/channel or one account — and show the user a localized reason on their next attempt, so a provider outage or a misconfig is explained instead of a silent dead button. - rail kill switch (payments.rail_status, per rail direct:web / direct:android / vk / telegram): enabled + a per-language message, edited on the catalog page. Fail-open — a rail with no row stays enabled, so payments are never accidentally killed. The intake gate (CanPurchase in handleWalletOrder, before the order) returns payment_unavailable + the localized message, orthogonal to the security gates. - per-account override (payments.account_payment_override, a row only for non-default): allow / deny / default, edited on the user card. "allow" bypasses ONLY the ops rail switch, never the security gates (trusted platform, the email anchor, the VK-iOS freeze, the min client version). - wire: an additive ExecuteResponse.message envelope field (frozen-contract-safe); the gateway forwards a backend domain-error message; the client shows it on a payment_unavailable buy attempt. - admin: rail toggles on the catalog page, the override control on the user card. - tests: the pure gate (unit, TDD), the store + gate + override end-to-end (integration, migration 00016), the client (svelte-check / vitest). - docs: PAYMENTS (+ru), the decisions log (D45/D46). Fiscalization stays cabinet-side (owner decision) — no itemized-receipt code. Contour-safe: additive migration (two new tables, no wipe), the wire add is additive, and fail-open so nothing is disabled until an operator acts.