feat: 백제약품 API 통합

- baekje_api.py: Flask Blueprint 추가
- order_api.py: submit_baekje_order 함수 추가
- admin_rx_usage.html: WHOLESALERS에 baekje 추가
- 환경변수: BAEKJE_USER_ID, BAEKJE_PASSWORD

URL: https://ibjp.co.kr (약국용 웹 주문 시스템)

backend/templates/admin_rx_usage.html

@@ -1072,8 +1072,17 @@
             gradient: 'linear-gradient(135deg, #7c3aed, #a855f7)',
             filterFn: (item) => item.supplier === '수인약품' || item.wholesaler === 'sooin',
             getCode: (item) => item.sooin_code || item.drug_code
+        },
+        baekje: {
+            id: 'baekje',
+            name: '백제약품',
+            icon: '💉',
+            logo: '/static/img/logo_baekje.png',
+            color: '#f59e0b',
+            gradient: 'linear-gradient(135deg, #d97706, #f59e0b)',
+            filterFn: (item) => item.supplier === '백제약품' || item.wholesaler === 'baekje',
+            getCode: (item) => item.baekje_code || item.drug_code
         }
-        // 향후 추가: baekje, etc.
     };
     
     // ──────────────── 주문 제출 ────────────────