feat: 회원 상세 - 관심 상품 탭 추가

- AI 업셀링에서 '관심있어요' 표시한 상품 조회
- status='interested'인 ai_recommendations 조회
- 상품명, 추천 메시지, 구매 상품(트리거) 표시
- 💝 관심 탭 UI 구현

backend/templates/admin_members.html

@@ -613,6 +613,7 @@
                 <div class="detail-tab active" data-tab="mileage" onclick="switchDetailTab('mileage')">📊 적립</div>
                 <div class="detail-tab" data-tab="purchase" onclick="switchDetailTab('purchase')">🛒 구매</div>
                 <div class="detail-tab" data-tab="prescription" onclick="switchDetailTab('prescription')">💊 조제</div>
+                <div class="detail-tab" data-tab="interest" onclick="switchDetailTab('interest')">💝 관심</div>
             </div>
             <div class="detail-content" id="detailContent">
                 <div class="detail-loading">데이터를 불러오는 중...</div>
@@ -893,6 +894,8 @@
             renderPurchaseTab(content);
         } else if (currentDetailTab === 'prescription') {
             renderPrescriptionTab(content);
+        } else if (currentDetailTab === 'interest') {
+            renderInterestTab(content);
         }
     }
 
@@ -1035,6 +1038,47 @@
             `;
         }).join('');
     }
+    
+    function renderInterestTab(container) {
+        // AI 업셀링에서 '관심있어요' 표시한 상품
+        if (!detailData.interests || detailData.interests.length === 0) {
+            container.innerHTML = '<div class="detail-empty">💝 관심 상품이 없습니다<br><small style="color:#94a3b8;">마일리지 적립 시 AI 추천에서 "관심있어요"를 누르면<br>여기에 표시됩니다</small></div>';
+            return;
+        }
+
+        container.innerHTML = detailData.interests.map(item => {
+            // 날짜 포맷
+            const date = item.created_at ? new Date(item.created_at).toLocaleString('ko-KR', {
+                month: 'short', day: 'numeric'
+            }) : '';
+            
+            // 트리거 상품 (JSON 파싱)
+            let triggerText = '';
+            try {
+                const triggers = JSON.parse(item.trigger_products || '[]');
+                if (triggers.length > 0) {
+                    triggerText = triggers.join(', ');
+                }
+            } catch(e) {}
+            
+            return `
+                <div class="purchase-card" style="border-left: 3px solid #ec4899;">
+                    <div class="purchase-header">
+                        <span style="font-size:15px;font-weight:700;color:#ec4899;">💝 ${escapeHtml(item.product)}</span>
+                        <span class="purchase-date">${date}</span>
+                    </div>
+                    <div style="font-size:13px;color:#475569;margin:8px 0;line-height:1.5;">
+                        ${escapeHtml(item.message || '')}
+                    </div>
+                    ${triggerText ? `
+                        <div style="font-size:11px;color:#94a3b8;margin-top:8px;">
+                            🛒 구매 상품: ${escapeHtml(triggerText)}
+                        </div>
+                    ` : ''}
+                </div>
+            `;
+        }).join('');
+    }
 
     function openSendFromDetail() {
         if (!currentDetailMember) return;