feat: 처방약품 사용량 페이지 - 주문량 지오영+수인 합산

- GET /api/geoyoung/orders/summary-by-kd 추가
- admin_rx_usage.html: 두 도매상 병렬 조회 후 합산 표시
- 콘솔에 도매상별 주문량 로깅

backend/geoyoung_api.py

@@ -567,6 +567,106 @@ def api_geoyoung_order_detail(order_num):
         }), 500
 
 
+@geoyoung_bp.route('/orders/summary-by-kd', methods=['GET'])
+def api_geoyoung_orders_by_kd():
+    """
+    지오영 주문량 KD코드별 집계 API
+    
+    GET /api/geoyoung/orders/summary-by-kd?start_date=2026-03-01&end_date=2026-03-07
+    
+    Returns:
+        {
+            "success": true,
+            "order_count": 4,
+            "by_kd_code": {
+                "670400830": {
+                    "product_name": "레바미피드정",
+                    "spec": "100T",
+                    "boxes": 2,
+                    "units": 200
+                }
+            },
+            "total_products": 15
+        }
+    """
+    import re
+    from datetime import datetime
+    
+    today = datetime.now().strftime("%Y-%m-%d")
+    start_date = request.args.get('start_date', today).strip()
+    end_date = request.args.get('end_date', today).strip()
+    
+    def parse_spec(spec: str) -> int:
+        """규격에서 수량 추출 (30T → 30, 100C → 100)"""
+        if not spec:
+            return 1
+        match = re.search(r'(\d+)', spec)
+        return int(match.group(1)) if match else 1
+    
+    try:
+        session = get_geo_session()
+        
+        # 주문 목록 조회 (items 포함)
+        orders_result = session.get_order_list(start_date, end_date)
+        
+        if not orders_result.get('success'):
+            return jsonify({
+                'success': False,
+                'error': orders_result.get('error', 'ORDERS_FETCH_FAILED'),
+                'by_kd_code': {},
+                'order_count': 0
+            })
+        
+        orders = orders_result.get('orders', [])
+        
+        # KD코드별 집계
+        kd_summary = {}
+        
+        for order in orders:
+            # 지오영은 get_order_list에서 items도 같이 반환
+            for item in order.get('items', []):
+                kd_code = item.get('kd_code', '')
+                if not kd_code:
+                    continue
+                
+                product_name = item.get('product_name', '')
+                spec = item.get('spec', '')
+                quantity = item.get('quantity', 0) or item.get('order_qty', 0)
+                per_unit = parse_spec(spec)
+                total_units = quantity * per_unit
+                
+                if kd_code not in kd_summary:
+                    kd_summary[kd_code] = {
+                        'product_name': product_name,
+                        'spec': spec,
+                        'boxes': 0,
+                        'units': 0
+                    }
+                
+                kd_summary[kd_code]['boxes'] += quantity
+                kd_summary[kd_code]['units'] += total_units
+        
+        logger.info(f"지오영 주문량 집계: {start_date}~{end_date}, {len(orders)}건 주문, {len(kd_summary)}개 품목")
+        
+        return jsonify({
+            'success': True,
+            'order_count': len(orders),
+            'period': {'start': start_date, 'end': end_date},
+            'by_kd_code': kd_summary,
+            'total_products': len(kd_summary)
+        })
+        
+    except Exception as e:
+        logger.error(f"지오영 주문량 집계 오류: {e}")
+        return jsonify({
+            'success': False,
+            'error': 'API_ERROR',
+            'message': str(e),
+            'by_kd_code': {},
+            'order_count': 0
+        }), 500
+
+
 @geoyoung_bp.route('/order-today', methods=['GET'])
 def api_geoyoung_order_today():
     """