Backoffice stage 5: products, broadcasts, activity log, settings

- Products: services with full setup — content (name, description, extras names
  in 5 languages via text overrides), price tiers and extras, booking window,
  late-cancel fee, on/off, checklist; category discounts by membership level;
  membership plan prices; promo codes; relocation steps and documents.
- Text overrides: TextOverride table on top of the i18n files; API, bots and the
  worker reload them every minute, mini apps fetch public.texts at start.
- Promo codes applied to orders (admin new-order form and client API): not
  stacked with membership discount — the larger wins; once per client; validity,
  limit and categories.
- Broadcasts to the client bot by any client filter, per-language texts with
  Russian fallback, test to yourself, ~25 msg/s, per-recipient status, resume after
  worker restart, history with progress and stop.
- Activity log (who/when/what, filters, details) and Settings page with all
  owner settings grouped, plus payment methods.
- Tests for promo codes and text overrides.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

packages/i18n/src/index.ts

@@ -56,12 +56,43 @@ function interpolate(s: string, params?: TParams) {
  * выбираются по params.count. Отсутствующий ключ возвращается как есть — его ловит `pnpm i18n:check`.
  */
 const merged = new Map<Locale, Messages>();
+/** Тексты, изменённые в админке (TextOverride): поверх переводов из locales/*.json */
+const overrides: Partial<Record<Locale, Messages>> = {};
+let overridesVersion = 0;
+const listeners = new Set<() => void>();
+
 function withFallback(locale: Locale): Messages {
   let m = merged.get(locale);
-  if (!m) merged.set(locale, (m = { ...resources.ru, ...(resources[locale] ?? {}) }));
+  // свой перевод языка важнее русской правки; своя правка языка важнее всего
+  if (!m) merged.set(locale, (m = { ...resources.ru, ...(overrides.ru ?? {}), ...(resources[locale] ?? {}), ...(overrides[locale] ?? {}) }));
   return m;
 }
 
+/**
+ * Подставить тексты из админки. Вызывают API, боты и воркер (из БД) и Mini App (из public.texts).
+ * После вызова createT отдаёт новые тексты; подписчики (React-провайдер) перерисовываются.
+ */
+export function setTextOverrides(rows: { key: string; locale: string; value: string }[]) {
+  for (const l of LOCALES) overrides[l] = {};
+  for (const r of rows) if (isLocale(r.locale) && r.value) overrides[r.locale]![r.key] = r.value;
+  merged.clear();
+  overridesVersion++;
+  for (const cb of listeners) cb();
+}
+
+/** Номер версии правок — чтобы мемоизированный t пересоздавался */
+export const textOverridesVersion = () => overridesVersion;
+
+export function onTextOverrides(cb: () => void) {
+  listeners.add(cb);
+  return () => listeners.delete(cb);
+}
+
+/** Стандартный перевод (без правок из админки) — подсказка в форме редактирования */
+export function defaultText(locale: Locale, key: string): string | null {
+  return resources[locale]?.[key] ?? null;
+}
+
 export function createT(locale: Locale): TFunction {
   return tFromMessages(locale, withFallback(locale));
 }