fix: 회원 상세 - transaction_id로 POS 품목 조회 연동

- 마일리지 적립 시 저장된 transaction_id로 SALE_SUB 조회
- 적립 내역에 구매 품목 표시 (품명, 수량, 가격)
- 구매 이력 탭: QR 적립된 구매만 품목과 함께 표시
- 기존 전화번호→고객코드 매핑 로직 제거 (불필요)

backend/templates/admin_members.html

@@ -906,6 +906,25 @@
                 month: 'short', day: 'numeric', hour: '2-digit', minute: '2-digit'
             }) : '';
             
+            // 품목 렌더링
+            let itemsHtml = '';
+            if (tx.items && tx.items.length > 0) {
+                itemsHtml = `
+                    <div class="tx-items">
+                        ${tx.items.map(item => `
+                            <div class="tx-item">
+                                <span class="tx-item-name">${escapeHtml(item.name)}</span>
+                                <span class="tx-item-qty">x${item.quantity}</span>
+                                <span class="tx-item-price">${item.price.toLocaleString()}원</span>
+                            </div>
+                        `).join('')}
+                    </div>
+                `;
+            }
+            
+            // 금액 표시
+            const amountText = tx.total_amount ? ` (${tx.total_amount.toLocaleString()}원 구매)` : '';
+            
             return `
                 <div class="tx-card ${isPositive ? '' : 'negative'}">
                     <div class="tx-header">
@@ -914,26 +933,34 @@
                             ${isPositive ? '+' : ''}${tx.points.toLocaleString()}P
                         </div>
                     </div>
-                    <div class="tx-desc">${escapeHtml(tx.description || tx.reason || '')}</div>
+                    <div class="tx-desc">${escapeHtml(tx.description || tx.reason || '')}${amountText}</div>
+                    ${itemsHtml}
                 </div>
             `;
         }).join('');
     }
 
     function renderPurchaseTab(container) {
-        if (!detailData.purchases || detailData.purchases.length === 0) {
-            container.innerHTML = '<div class="detail-empty">📭 구매 이력이 없습니다<br><small style="color:#94a3b8;">최근 30일 내역만 표시됩니다</small></div>';
+        // 적립 내역 중 품목이 있는 것들만 추출
+        if (!detailData.mileage || !detailData.mileage.transactions) {
+            container.innerHTML = '<div class="detail-empty">📭 구매 이력이 없습니다</div>';
+            return;
+        }
+        
+        const purchases = detailData.mileage.transactions.filter(tx => 
+            tx.items && tx.items.length > 0 && tx.points > 0
+        );
+        
+        if (purchases.length === 0) {
+            container.innerHTML = '<div class="detail-empty">📭 QR 적립된 구매 이력이 없습니다</div>';
             return;
         }
 
-        const purchases = detailData.purchases;
         container.innerHTML = purchases.map(p => {
             // 날짜 포맷
-            const dateStr = p.date || '';
-            let formattedDate = dateStr;
-            if (dateStr.length === 8) {
-                formattedDate = `${dateStr.slice(0,4)}-${dateStr.slice(4,6)}-${dateStr.slice(6,8)}`;
-            }
+            const date = p.created_at ? new Date(p.created_at).toLocaleString('ko-KR', {
+                year: 'numeric', month: 'short', day: 'numeric'
+            }) : '';
             
             // 품목 렌더링
             const itemsHtml = (p.items || []).map(item => `
@@ -947,9 +974,10 @@
             return `
                 <div class="purchase-card">
                     <div class="purchase-header">
-                        <span class="purchase-date">📅 ${formattedDate}</span>
-                        <span class="purchase-total">${p.total.toLocaleString()}원</span>
+                        <span class="purchase-date">📅 ${date}</span>
+                        <span class="purchase-total">${(p.total_amount || 0).toLocaleString()}원</span>
                     </div>
+                    <div style="font-size:12px;color:#10b981;margin-bottom:8px;">+${p.points.toLocaleString()}P 적립</div>
                     ${p.items && p.items.length > 0 ? `
                         <div class="purchase-items">${itemsHtml}</div>
                     ` : ''}