feat(drug-usage): 환자 뱃지 + limit 5000 + 현재고 IM_total

- 조제목록에 환자 뱃지 표시 (3명 이하: 전체, 3명 초과: 최근 3명 + 외 N명)
- API에 unique_patients, recent_patients 필드 추가
- limit 1000 → 5000 증가
- 현재고: 계산 방식 → IM_total.IM_QT_sale_debit (실제 DB 값)

backend/templates/admin_drug_usage.html

@@ -371,6 +371,25 @@
             color: #10b981;
             font-weight: 500;
         }
+        .patient-info {
+            display: inline-flex;
+            gap: 4px;
+            margin-left: 8px;
+            flex-wrap: wrap;
+        }
+        .patient-badge {
+            display: inline-block;
+            padding: 2px 8px;
+            font-size: 11px;
+            font-weight: 500;
+            background: #e0f2fe;
+            color: #0369a1;
+            border-radius: 12px;
+        }
+        .patient-badge.more {
+            background: #fef3c7;
+            color: #92400e;
+        }
         .detail-table {
             width: 100%;
             border-collapse: separate;
@@ -508,11 +527,12 @@
                             <th class="sortable" data-sort="import_count">입고건수</th>
                             <th class="sortable" data-sort="rx_total_qty">조제량</th>
                             <th class="sortable" data-sort="import_total_qty">입고량</th>
+                            <th class="sortable" data-sort="current_stock">현재고</th>
                         </tr>
                     </thead>
                     <tbody id="drugUsageBody">
                         <tr>
-                            <td colspan="7" class="empty-state">
+                            <td colspan="8" class="empty-state">
                                 <div class="icon">📊</div>
                                 <p>기간을 선택하고 조회 버튼을 클릭하세요</p>
                             </td>
@@ -584,7 +604,7 @@
         btn.textContent = '조회 중...';
         tbody.innerHTML = `
             <tr>
-                <td colspan="7" class="loading-state">
+                <td colspan="8" class="loading-state">
                     <div class="loading-spinner"></div>
                     <p>데이터를 불러오는 중...</p>
                 </td>
@@ -596,7 +616,7 @@
                 start_date: startDate.replace(/-/g, ''),
                 end_date: endDate.replace(/-/g, ''),
                 date_type: dateType,
-                limit: 1000  // 전체 조회 후 클라이언트에서 페이징
+                limit: 5000  // 전체 조회 후 클라이언트에서 페이징
             });
             if (search) params.append('search', search);
 
@@ -621,7 +641,7 @@
             } else {
                 tbody.innerHTML = `
                     <tr>
-                        <td colspan="7" class="empty-state">
+                        <td colspan="8" class="empty-state">
                             <div class="icon">⚠️</div>
                             <p>오류: ${escapeHtml(data.error || '알 수 없는 오류')}</p>
                         </td>
@@ -631,7 +651,7 @@
         } catch (err) {
             tbody.innerHTML = `
                 <tr>
-                    <td colspan="7" class="empty-state">
+                    <td colspan="8" class="empty-state">
                         <div class="icon">❌</div>
                         <p>조회 실패: ${escapeHtml(err.message)}</p>
                     </td>
@@ -700,7 +720,7 @@
         if (filteredData.length === 0) {
             tbody.innerHTML = `
                 <tr>
-                    <td colspan="7" class="empty-state">
+                    <td colspan="8" class="empty-state">
                         <div class="icon">📭</div>
                         <p>조회 결과가 없습니다</p>
                     </td>
@@ -725,9 +745,10 @@
                 <td class="num-cell num-secondary">${formatNumber(item.import_count)}</td>
                 <td class="num-cell num-highlight">${formatNumber(item.rx_total_qty)}</td>
                 <td class="num-cell num-secondary">${formatNumber(item.import_total_qty)}</td>
+                <td class="num-cell">${formatNumber(item.current_stock)}</td>
             </tr>
             <tr class="detail-row" id="detail-${escapeHtml(item.drug_code)}" style="display:${expandedDrugCode === item.drug_code ? 'table-row' : 'none'};">
-                <td colspan="7">
+                <td colspan="8">
                     <div class="detail-panel">
                         <div class="detail-left" id="imports-${escapeHtml(item.drug_code)}">
                             <h4>📦 입고목록 <span class="count"></span></h4>
@@ -846,8 +867,25 @@
             const data = await res.json();
             
             if (data.success && data.items.length > 0) {
+                // 환자 뱃지 생성
+                const uniqueCount = data.unique_patients || 0;
+                const recentPatients = data.recent_patients || [];
+                let patientBadges = '';
+                
+                if (uniqueCount <= 3) {
+                    // 3명 이하: 전체 표시
+                    patientBadges = recentPatients.map(p => 
+                        `<span class="patient-badge">${escapeHtml(p)}</span>`
+                    ).join('');
+                } else {
+                    // 3명 초과: 최근 3명 + 외 N명
+                    patientBadges = recentPatients.map(p => 
+                        `<span class="patient-badge">${escapeHtml(p)}</span>`
+                    ).join('') + `<span class="patient-badge more">외 ${uniqueCount - 3}명</span>`;
+                }
+                
                 container.innerHTML = `
-                    <h4>💊 조제목록 <span class="count">(${data.total_count}건)</span></h4>
+                    <h4>💊 조제목록 <span class="count">(${data.total_count}건)</span> <span class="patient-info">${patientBadges}</span></h4>
                     <table class="detail-table" style="table-layout:fixed;">
                         <colgroup>
                             <col style="width:65px;">