feat(admin): D16 (b)(c) — Excel order-item report, document-confirm SMS, %name in bulk SMS

Finished from a parallel session that expired (owner: «بساز»).

- RPT-01: GET admin/report/order-items — legacy report/order_item's
  32-column Excel (order items, one row per unit, plus financial
  documents), RTL, Jalali dates. The «گزارش تجمیعی» screen gets
  «دریافت فایل اکسل». Review fixes:
  - weight: computedWeightGrams is already one unit's weight; legacy
    divided it by qty again, under-reporting «بدهکار» on multi-unit
    lines. Not repeated.
  - «درصد»: the final percent (wage − discount), as legacy.
  - dates: the end date covers its whole day; a bad date is a 400.
- SMS-01: confirming or rejecting a financial document texts the customer,
  as legacy CashController::toggleConfiremCash.
- SMS-02: bulk SMS substitutes %name per recipient and is actually sent
  through the configured gateway (D26 relay), no longer only logged.
- Docs: 01-ADMIN-MATRIX and D16-BC-GAP-SUMMARY.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/admin-panel/src/views/report/order_item.vue

@@ -14,7 +14,11 @@
             <DateInput v-model="filters.start_date" label="از تاریخ" />
             <DateInput v-model="filters.end_date" label="تا تاریخ" />
             <a-form-item label=" ">
-              <a-button type="primary" @click="load">اعمال</a-button>
+              <a-space>
+                <a-button type="primary" @click="load">اعمال</a-button>
+                <!-- legacy's only output: «دریافت گزارش», the 32-column Excel file -->
+                <a-button :loading="downloading" @click="downloadExcel">دریافت فایل اکسل</a-button>
+              </a-space>
             </a-form-item>
           </div>
         </a-form>
@@ -46,6 +50,7 @@
 
 <script setup lang="ts">
 import { onMounted, reactive, ref } from 'vue';
+import { message } from 'ant-design-vue';
 import DateInput from '../../components/input/DateInput.vue';
 import { jdate } from '../../utils/filters';
 import api from '../../api/client';
@@ -83,6 +88,27 @@ async function load() {
   }
 }
 
+const downloading = ref(false);
+
+/** Legacy getReport: the order items + financial documents of the range as Excel. */
+async function downloadExcel() {
+  try {
+    downloading.value = true;
+    const { data } = await api.get('admin/report/order-items', { params: filters, responseType: 'blob' });
+    const url = URL.createObjectURL(data as Blob);
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = `report-${filters.start_date ?? 'all'}-${filters.end_date ?? 'all'}.xlsx`;
+    a.click();
+    URL.revokeObjectURL(url);
+  } catch (e) {
+    console.log(e);
+    message.error('خطا در دریافت فایل');
+  } finally {
+    downloading.value = false;
+  }
+}
+
 onMounted(load);
 </script>