feat(pmr): 라벨 인쇄 기능 구현 및 환산계수 개선

- Brother QL 라벨 인쇄 API 추가 (POST /pmr/api/label/print)
- PMR 라벨 인쇄 버튼 동작 구현 (QL-810W)
- 환산계수 sung_code 프론트→백엔드 전달 추가
- 환산계수 모달 제품명 readonly 처리 (MSSQL 원본 보호)
- Pillow 10+ 호환성 패치 (ANTIALIAS → LANCZOS)

backend/pmr_api.py

@@ -36,6 +36,10 @@ from pathlib import Path
 from datetime import datetime, date
 import logging
 from PIL import Image, ImageDraw, ImageFont
+
+# Pillow 10+ 호환성 패치 (brother_ql용)
+if not hasattr(Image, 'ANTIALIAS'):
+    Image.ANTIALIAS = Image.Resampling.LANCZOS
 import io
 import base64
 import os
@@ -624,6 +628,101 @@ def preview_label():
         return jsonify({'success': False, 'error': str(e)}), 500
 
 
+# API: 라벨 인쇄 (Brother QL 프린터)
+# ─────────────────────────────────────────────────────────────
+@pmr_bp.route('/api/label/print', methods=['POST'])
+def print_label():
+    """
+    라벨 인쇄 (PIL 렌더링 → Brother QL 프린터 전송)
+    
+    Request Body:
+        - patient_name, med_name, dosage, frequency, duration, unit, sung_code
+        - printer: 프린터 선택 (선택, 기본값 '168')
+            - '121': QL-710W (192.168.0.121)
+            - '168': QL-810W (192.168.0.168)
+    """
+    try:
+        from brother_ql.raster import BrotherQLRaster
+        from brother_ql.conversion import convert
+        from brother_ql.backends.helpers import send
+        
+        data = request.get_json()
+        
+        patient_name = data.get('patient_name', '')
+        med_name = data.get('med_name', '')
+        add_info = data.get('add_info', '')
+        dosage = float(data.get('dosage', 0))
+        frequency = int(data.get('frequency', 0))
+        duration = int(data.get('duration', 0))
+        unit = data.get('unit', '정')
+        sung_code = data.get('sung_code', '')
+        printer = data.get('printer', '168')  # 기본값: QL-810W
+        
+        # 프린터 설정
+        if printer == '121':
+            printer_ip = '192.168.0.121'
+            printer_model = 'QL-710W'
+        else:
+            printer_ip = '192.168.0.168'
+            printer_model = 'QL-810W'
+        
+        # 환산계수 조회
+        conversion_factor = None
+        if sung_code:
+            try:
+                from db.dbsetup import db_manager
+                cf_result = db_manager.get_conversion_factor(sung_code)
+                conversion_factor = cf_result.get('conversion_factor')
+            except Exception as cf_err:
+                logging.warning(f"환산계수 조회 실패 (무시): {cf_err}")
+        
+        # 1. 라벨 이미지 생성
+        label_image = create_label_image(
+            patient_name=patient_name,
+            med_name=med_name,
+            add_info=add_info,
+            dosage=dosage,
+            frequency=frequency,
+            duration=duration,
+            unit=unit,
+            conversion_factor=conversion_factor
+        )
+        
+        # 2. 이미지 90도 회전 (Brother QL이 세로 방향 기준이므로)
+        label_rotated = label_image.rotate(90, expand=True)
+        
+        # 3. Brother QL 프린터로 전송
+        qlr = BrotherQLRaster(printer_model)
+        instructions = convert(
+            qlr=qlr,
+            images=[label_rotated],
+            label='29',
+            rotate='0',
+            threshold=70.0,
+            dither=False,
+            compress=False,
+            red=False,
+            dpi_600=False,
+            hq=True,
+            cut=True
+        )
+        send(instructions, printer_identifier=f"tcp://{printer_ip}:9100")
+        
+        logging.info(f"[SUCCESS] PMR 라벨 인쇄 성공: {med_name} → {printer_model}")
+        return jsonify({
+            'success': True,
+            'message': f'{med_name} 라벨 인쇄 완료 ({printer_model})',
+            'printer': printer_model
+        })
+        
+    except ImportError as e:
+        logging.error(f"brother_ql 라이브러리 없음: {e}")
+        return jsonify({'success': False, 'error': 'brother_ql 라이브러리가 설치되지 않았습니다'}), 500
+    except Exception as e:
+        logging.error(f"라벨 인쇄 오류: {e}")
+        return jsonify({'success': False, 'error': str(e)}), 500
+
+
 def normalize_medication_name(med_name):
     """
     약품명 정제 - 밀리그램 등을 mg로 변환, 불필요한 부분 제거

backend/templates/pmr.html

@@ -2985,14 +2985,76 @@
             document.getElementById('previewModal').style.display = 'none';
         }
         
-        // 라벨 인쇄 (TODO: 구현)
+        // 라벨 인쇄 (Brother QL 프린터)
-        function printLabels() {
+        async function printLabels() {
-            const selected = Array.from(document.querySelectorAll('.med-check:checked')).map(c => c.dataset.code);
+            const checkboxes = document.querySelectorAll('.med-check:checked');
-            if (selected.length === 0) {
+            if (checkboxes.length === 0) {
                 alert('인쇄할 약품을 선택하세요');
                 return;
             }
-            alert(`선택된 약품 ${selected.length}개 인쇄 기능은 추후 구현 예정입니다.\n\n${selected.join('\n')}`);
+            
+            const patientName = document.querySelector('.patient-info h2')?.textContent?.trim() || '';
+            let printedCount = 0;
+            let failedCount = 0;
+            
+            for (const checkbox of checkboxes) {
+                const tr = checkbox.closest('tr');
+                if (!tr) continue;
+                
+                const cells = tr.querySelectorAll('td');
+                const medName = tr.dataset.medName || cells[1]?.querySelector('.med-name')?.textContent?.replace(/^\d+/, '').trim() || '';
+                const addInfo = tr.dataset.addInfo || '';
+                const sungCode = tr.dataset.sungCode || '';
+                const unit = tr.dataset.unit || '정';
+                
+                // 용량 파싱 (1회 투약량)
+                const doseText = cells[2]?.textContent || '0';
+                const dosage = parseFloat(doseText.replace(/[^0-9.]/g, '')) || 0;
+                
+                // 횟수 파싱
+                const freqText = cells[3]?.textContent || '0';
+                const frequency = parseInt(freqText.replace(/[^0-9]/g, '')) || 0;
+                
+                // 일수 파싱
+                const durText = cells[4]?.textContent?.replace(/[^0-9]/g, '') || '0';
+                const duration = parseInt(durText) || 0;
+                
+                try {
+                    const res = await fetch('/pmr/api/label/print', {
+                        method: 'POST',
+                        headers: {'Content-Type': 'application/json'},
+                        body: JSON.stringify({
+                            patient_name: patientName,
+                            med_name: medName,
+                            add_info: addInfo,
+                            dosage: dosage,
+                            frequency: frequency,
+                            duration: duration,
+                            unit: unit,
+                            sung_code: sungCode,
+                            printer: '168'  // 기본: QL-810W
+                        })
+                    });
+                    const data = await res.json();
+                    
+                    if (data.success) {
+                        printedCount++;
+                        console.log('Print success:', medName);
+                    } else {
+                        failedCount++;
+                        console.error('Print failed:', medName, data.error);
+                    }
+                } catch (err) {
+                    failedCount++;
+                    console.error('Print error:', medName, err);
+                }
+            }
+            
+            if (failedCount === 0) {
+                alert(`✅ ${printedCount}개 라벨 인쇄 완료!`);
+            } else {
+                alert(`⚠️ 인쇄 완료: ${printedCount}개\n실패: ${failedCount}개`);
+            }
         }
         
         // ═══════════════════════════════════════════════════════════════════════════
@@ -3424,8 +3486,8 @@
                         <input type="text" id="drysyrup_ingredient_name" placeholder="예: 아목시실린">
                     </div>
                     <div class="drysyrup-form-row">
-                        <label>제품명</label>
+                        <label>제품명 <span style="font-size:0.75rem;color:#6b7280;">(MSSQL 원본)</span></label>
-                        <input type="text" id="drysyrup_product_name" placeholder="예: 오구멘틴듀오시럽">
+                        <input type="text" id="drysyrup_product_name" placeholder="예: 오구멘틴듀오시럽" readonly style="background:#f3f4f6;cursor:not-allowed;">
                     </div>
                     <div class="drysyrup-form-row">
                         <label>환산계수 (g/ml)</label>