feat(admin): implement order and customer operations experience

Orders dashboard (real orders-today/pending/paid/cancelled/refunded/customers/returning-customers/average-order/recent-activity/system-alerts, computed from the full order book not just the current page); orders list gains density, saved column visibility, bulk status change/archive/delete/export/print alongside existing search+status filter+pagination, sticky table header; order detail gets a visual status workflow stepper in business language (Pending/Packing/Shipping/Completed, with Cancelled/Refunded as terminal states) and a reusable OrderTimelineComponent replacing the flat text log; added a derived Customers feature (list + profile detail: statistics/lifetime value/addresses/orders/activity/notes) built entirely by grouping existing AdminOrder records by email - no new backend, no invented gateway, since no customer entity existed. Added archive/restore/delete to the orders gateway (soft-delete pattern mirroring categories) and filled in the adminOrders/adminCustomers i18n namespaces, which previously didn't exist at all (every adminOrders.* label was rendering as a raw key).

src/app/i18n/en.ts

@@ -1140,6 +1140,82 @@ export const en: Translations = {
     optionalDataMissingDescription: 'Optional configuration data is absent.',
     optionalDataMissingResolution: 'Add optional value if UX depends on it.',
   },
+  adminOrders: {
+    back: 'Back to orders',
+    search: 'Search by order number, name, email, or phone…',
+    export: 'Export',
+    view: 'View',
+    orderNumber: 'Order',
+    customer: 'Customer',
+    payment: 'Payment',
+    delivery: 'Delivery',
+    trackingNumber: 'Tracking number',
+    createdAt: 'Placed',
+    items: 'Items',
+    timeline: 'Timeline',
+    notes: 'Notes to customer',
+    internalNotes: 'Internal notes',
+    addNote: 'Add note',
+    changeStatus: 'Change status',
+    applyStatus: 'Apply',
+    archiveSelected: 'Archive',
+    printSelected: 'Print',
+    printInvoice: 'Print invoice',
+    requestRefund: 'Request refund',
+    cancelOrder: 'Cancel order',
+    confirmCancel: 'Cancel this order?',
+    confirmRefund: 'Request a refund for this order?',
+    emptyTitle: 'No orders yet',
+    emptyDescription: 'Orders will show up here as customers check out.',
+    column_customer: 'Customer',
+    column_status: 'Status',
+    column_payment: 'Payment',
+    column_total: 'Total',
+    column_created: 'Placed',
+    status: {
+      pending: 'Pending',
+      processing: 'Packing',
+      shipped: 'Shipping',
+      delivered: 'Completed',
+      cancelled: 'Cancelled',
+      refunded: 'Refunded',
+    },
+    paymentStatus: {
+      unpaid: 'Unpaid',
+      paid: 'Paid',
+      refund_requested: 'Refund requested',
+      refunded: 'Refunded',
+    },
+    ordersToday: 'Orders today',
+    paidCount: 'Paid',
+    customersCount: 'Customers',
+    returningCustomers: 'Returning customers',
+    averageOrder: 'Average order',
+    recentActivity: 'Recent activity',
+    noRecentActivity: 'No activity yet.',
+    alertStuckPending: 'orders have been pending for over 48 hours',
+    alertRefundRequested: 'orders have a refund request waiting',
+  },
+  adminCustomers: {
+    search: 'Search by name, email, or phone…',
+    name: 'Name',
+    email: 'Email',
+    phone: 'Phone',
+    orderCount: 'Orders',
+    lifetimeValue: 'Lifetime value',
+    returning: 'Returning',
+    profile: 'Profile',
+    statistics: 'Statistics',
+    firstOrder: 'First order',
+    lastOrder: 'Last order',
+    addresses: 'Addresses',
+    notes: 'Notes',
+    notesUnavailable: 'No customer-level notes yet — add a note on one of their orders instead.',
+    orders: 'Orders',
+    activity: 'Activity',
+    emptyTitle: 'No customers yet',
+    emptyDescription: 'Customers appear here once they place their first order.',
+  },
   mediaLibrary: {
     title: 'Media Library',
     upload: 'Upload',
@@ -1464,6 +1540,7 @@ export const en: Translations = {
       products: 'Products',
       categories: 'Categories',
       orders: 'Orders',
+      customers: 'Customers',
       transactions: 'Transactions',
       reviews: 'Reviews',
       reports: 'Reports',
@@ -1502,6 +1579,8 @@ export const en: Translations = {
       categoryEdit: { title: 'Edit category', description: 'Change this category\'s details' },
       orders: { title: 'Orders', description: 'View and process customer orders' },
       orderDetail: { title: 'Order', description: 'Order details and status' },
+      customers: { title: 'Customers', description: 'Everyone who has placed an order' },
+      customerDetail: { title: 'Customer', description: 'Customer profile, orders, and activity' },
       transactions: { title: 'Transactions', description: 'Payments, refunds, and fraud review' },
       media: { title: 'Media Library', description: 'Images and files for products and pages' },
       users: { title: 'Users', description: 'Admin team members and permissions' },