feat: PMR OTC 구매 이력 기능

- /pmr/api/patient/<cus_code>/otc: OTC 구매 이력 API
- SALE_MAIN + SALE_SUB (PRESERIAL='V' = OTC)
- 💊 OTC 뱃지 클릭 → 모달로 구매 이력 표시
- 자주 구매하는 품목 요약
- 방문/금액 통계

backend/pmr_api.py

@@ -650,3 +650,134 @@ def get_patient_history(cus_code):
     except Exception as e:
         logging.error(f"환자 이전 처방 조회 오류: {e}")
         return jsonify({'success': False, 'error': str(e)}), 500
+
+
+# ─────────────────────────────────────────────────────────────
+# API: 환자 OTC 구매 이력
+# ─────────────────────────────────────────────────────────────
+@pmr_bp.route('/api/patient/<cus_code>/otc', methods=['GET'])
+def get_patient_otc_history(cus_code):
+    """
+    환자 OTC (일반의약품) 구매 이력 조회
+    
+    Args:
+        cus_code: 환자 고유코드 (CusCode = SL_CD_custom)
+        
+    Query Params:
+        - limit: 최대 조회 건수 (기본 20, 최대 100)
+    """
+    try:
+        limit = min(int(request.args.get('limit', 20)), 100)
+        
+        conn = get_mssql_connection('PM_PRES')
+        cursor = conn.cursor()
+        
+        # OTC 거래 목록 조회 (PRESERIAL = 'V' = OTC 판매)
+        cursor.execute("""
+            SELECT 
+                m.SL_NO_order,
+                m.SL_DT_appl,
+                m.InsertTime,
+                m.SL_MY_sale,
+                m.SL_NM_custom
+            FROM SALE_MAIN m
+            WHERE m.SL_CD_custom = ?
+              AND m.PRESERIAL = 'V'
+            ORDER BY m.InsertTime DESC
+        """, (cus_code,))
+        
+        # 먼저 거래 목록 수집
+        orders = []
+        for row in cursor.fetchall():
+            orders.append({
+                'order_no': row.SL_NO_order,
+                'date': row.SL_DT_appl,
+                'datetime': row.InsertTime.strftime('%Y-%m-%d %H:%M') if row.InsertTime else '',
+                'amount': int(row.SL_MY_sale or 0),
+                'customer_name': row.SL_NM_custom or ''
+            })
+        
+        # 최근 limit개만
+        orders = orders[:limit]
+        
+        if not orders:
+            conn.close()
+            return jsonify({
+                'success': True,
+                'cus_code': cus_code,
+                'count': 0,
+                'purchases': []
+            })
+        
+        # 각 거래의 품목 조회
+        purchases = []
+        for order in orders:
+            cursor.execute("""
+                SELECT 
+                    s.DrugCode,
+                    g.GoodsName,
+                    s.SL_NM_item,
+                    s.SL_TOTAL_PRICE,
+                    mc.PRINT_TYPE
+                FROM SALE_SUB s
+                LEFT JOIN PM_DRUG.dbo.CD_GOODS g ON s.DrugCode = g.DrugCode
+                LEFT JOIN PM_DRUG.dbo.CD_MC mc ON s.DrugCode = mc.DRUGCODE
+                WHERE s.SL_NO_order = ?
+                ORDER BY s.DrugCode
+            """, (order['order_no'],))
+            
+            items = []
+            for item_row in cursor.fetchall():
+                items.append({
+                    'drug_code': item_row.DrugCode or '',
+                    'name': item_row.GoodsName or item_row.DrugCode or '',
+                    'quantity': int(item_row.SL_NM_item or 0),
+                    'price': int(item_row.SL_TOTAL_PRICE or 0),
+                    'category': item_row.PRINT_TYPE or ''
+                })
+            
+            purchases.append({
+                **order,
+                'items': items,
+                'item_count': len(items)
+            })
+        
+        conn.close()
+        
+        # 통계 계산
+        total_amount = sum(p['amount'] for p in purchases)
+        total_visits = len(purchases)
+        
+        # 자주 구매하는 품목 집계
+        item_freq = {}
+        for p in purchases:
+            for item in p['items']:
+                key = item['drug_code']
+                if key not in item_freq:
+                    item_freq[key] = {
+                        'name': item['name'],
+                        'category': item['category'],
+                        'count': 0,
+                        'total_qty': 0
+                    }
+                item_freq[key]['count'] += 1
+                item_freq[key]['total_qty'] += item['quantity']
+        
+        # 빈도순 정렬
+        frequent_items = sorted(item_freq.values(), key=lambda x: x['count'], reverse=True)[:10]
+        
+        return jsonify({
+            'success': True,
+            'cus_code': cus_code,
+            'count': len(purchases),
+            'summary': {
+                'total_visits': total_visits,
+                'total_amount': total_amount,
+                'frequent_items': frequent_items
+            },
+            'purchases': purchases
+        })
+        
+    except Exception as e:
+        logging.error(f"환자 OTC 구매 이력 조회 오류: {e}")
+        return jsonify({'success': False, 'error': str(e)}), 500