fix(backoffice): wording quality pass across orders, moderation, transactions, users, customers

- Replaced hardcoded English audit/timeline text (order status changes,
  review moderation events, user role/status changes) with proper
  adminXxx.timelineEvent.*/adminUsers.audit.* i18n keys, so Recent
  Activity/Timeline/Audit panels no longer mix English into ru/hy UI.
- Translated raw internal codes rendered directly to users: transaction
  payment method ('card'/'qr'/'cash_on_delivery' -> adminTransactions.methodValue.*)
  and user roles/permissions ('products.manage' etc -> adminUsers.roleValue.*/
  adminUsers.permission.*), replacing developer-facing enum leakage with
  real copy.
- Fixed wrong-noun list-footer counts: Orders/Transactions/Moderation
  list pages all reused adminProducts.items ("N товаров"/"N products")
  regardless of what was actually listed; each now has its own itemsCount
  key ("N заказов", "N транзакций", "N отзывов").
- Fixed customer detail page's "Back" button reusing adminOrders.back
  ("Back to orders") instead of a customers-specific label.
- Added translation keys to en/ru/hy + translations.ts interface for all
  of the above.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/i18n/en.ts

@@ -1231,6 +1231,7 @@ export const en: Translations = {
   adminModeration: {
     search: 'Search by customer, product, or review text…',
     selectAllRows: 'Select all reviews',
+    itemsCount: 'reviews',
     allStatuses: 'All statuses',
     allRatings: 'All ratings',
     rating: 'Rating',
@@ -1287,6 +1288,16 @@ export const en: Translations = {
       rejected: 'Rejected',
       spam: 'Spam',
     },
+    timelineEvent: {
+      submitted: 'Review submitted',
+      statusChanged: 'Status changed to "{{status}}"',
+      restored: 'Review restored',
+      hidden: 'Review hidden',
+    },
+    actor: {
+      admin: 'Admin',
+      customer: 'Customer',
+    },
     targetType: {
       product: 'Product',
       review: 'Review',
@@ -1315,6 +1326,11 @@ export const en: Translations = {
     createdAt: 'Placed',
     items: 'Items',
     timeline: 'Timeline',
+    timelineEvent: {
+      created: 'Order created',
+      statusChanged: 'Status changed to "{{status}}"',
+      refundRequested: 'Refund requested',
+    },
     notes: 'Notes to customer',
     internalNotes: 'Internal notes',
     addNote: 'Add note',
@@ -1349,6 +1365,7 @@ export const en: Translations = {
       refund_requested: 'Refund requested',
       refunded: 'Refunded',
     },
+    itemsCount: 'orders',
     ordersToday: 'Orders today',
     paidCount: 'Paid',
     customersCount: 'Customers',
@@ -1360,6 +1377,7 @@ export const en: Translations = {
     alertRefundRequested: 'orders have a refund request waiting',
   },
   adminCustomers: {
+    back: 'Back to customers',
     search: 'Search by name, email, or phone…',
     name: 'Name',
     email: 'Email',
@@ -1749,11 +1767,34 @@ export const en: Translations = {
       expired: 'Expired',
       revoked: 'Revoked',
     },
+    roleValue: {
+      owner: 'Owner',
+      admin: 'Admin',
+      editor: 'Editor',
+      viewer: 'Viewer',
+    },
+    permission: {
+      all: 'Full access to everything',
+      productsManage: 'Manage products',
+      productsView: 'View products',
+      categoriesManage: 'Manage categories',
+      ordersManage: 'Manage orders',
+      ordersView: 'View orders',
+      mediaManage: 'Manage media library',
+    },
+    actor: {
+      admin: 'Admin',
+    },
+    audit: {
+      roleChanged: 'Role changed to "{{role}}"',
+      statusChanged: 'Status changed to "{{status}}"',
+    },
   },
   adminTransactions: {
     search: 'Search transactions',
     type: 'Type',
     method: 'Payment method',
+    itemsCount: 'transactions',
     fraud: 'Fraud check',
     flagged: 'Flagged',
     flag: 'Flag as suspicious',
@@ -1775,6 +1816,11 @@ export const en: Translations = {
       refund: 'Refund',
       qr_payment: 'QR payment',
     },
+    methodValue: {
+      card: 'Card',
+      qr: 'QR code',
+      cash_on_delivery: 'Cash on delivery',
+    },
   },
   adminMonitoring: {
     eventsEmptyTitle: 'No events found',