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/translations.ts

@@ -1138,6 +1138,82 @@ export interface Translations {
     optionalDataMissingDescription: string;
     optionalDataMissingResolution: string;
   };
+  adminOrders: {
+    back: string;
+    search: string;
+    export: string;
+    view: string;
+    orderNumber: string;
+    customer: string;
+    payment: string;
+    delivery: string;
+    trackingNumber: string;
+    createdAt: string;
+    items: string;
+    timeline: string;
+    notes: string;
+    internalNotes: string;
+    addNote: string;
+    changeStatus: string;
+    applyStatus: string;
+    archiveSelected: string;
+    printSelected: string;
+    printInvoice: string;
+    requestRefund: string;
+    cancelOrder: string;
+    confirmCancel: string;
+    confirmRefund: string;
+    emptyTitle: string;
+    emptyDescription: string;
+    column_customer: string;
+    column_status: string;
+    column_payment: string;
+    column_total: string;
+    column_created: string;
+    status: {
+      pending: string;
+      processing: string;
+      shipped: string;
+      delivered: string;
+      cancelled: string;
+      refunded: string;
+    };
+    paymentStatus: {
+      unpaid: string;
+      paid: string;
+      refund_requested: string;
+      refunded: string;
+    };
+    ordersToday: string;
+    paidCount: string;
+    customersCount: string;
+    returningCustomers: string;
+    averageOrder: string;
+    recentActivity: string;
+    noRecentActivity: string;
+    alertStuckPending: string;
+    alertRefundRequested: string;
+  };
+  adminCustomers: {
+    search: string;
+    name: string;
+    email: string;
+    phone: string;
+    orderCount: string;
+    lifetimeValue: string;
+    returning: string;
+    profile: string;
+    statistics: string;
+    firstOrder: string;
+    lastOrder: string;
+    addresses: string;
+    notes: string;
+    notesUnavailable: string;
+    orders: string;
+    activity: string;
+    emptyTitle: string;
+    emptyDescription: string;
+  };
   mediaLibrary: {
     title: string;
     upload: string;
@@ -1471,6 +1547,7 @@ export interface Translations {
       products: string;
       categories: string;
       orders: string;
+      customers: string;
       transactions: string;
       reviews: string;
       reports: string;
@@ -1509,6 +1586,8 @@ export interface Translations {
       categoryEdit: { title: string; description: string };
       orders: { title: string; description: string };
       orderDetail: { title: string; description: string };
+      customers: { title: string; description: string };
+      customerDetail: { title: string; description: string };
       transactions: { title: string; description: string };
       media: { title: string; description: string };
       users: { title: string; description: string };