feat: 비급여/100% 표시 - UnitCode 기반

- UnitCode 컬럼 추가 (같은 테이블, 쿼리 부담 없음)
- UnitCode=2: 비) 비급여 (빨간색)
- UnitCode=3: 100) 전액본인부담 (보라색)
- 기존 대체조제 배지와 함께 표시 가능

backend/pmr_api.py

@@ -201,6 +201,7 @@ def get_prescription_detail(prescription_id):
                 s.PS_Type,
                 s.INV_QUAN,
                 s.SUB_SERIAL,
+                s.UnitCode,
                 g.GoodsName,
                 g.SUNG_CODE,
                 m.PRINT_TYPE,
@@ -236,6 +237,9 @@ def get_prescription_detail(prescription_id):
             is_substituted = row.PS_Type == '4' and (i + 1) in original_prescriptions
             original_drug = original_prescriptions.get(i + 1) if is_substituted else None
             
+            # UnitCode: 1=보험, 2=비보험, 3=100/100, 4~7=급여(본인부담률)
+            unit_code = int(row.UnitCode) if row.UnitCode else 1
+            
             medications.append({
                 'medication_code': row.DrugCode or '',
                 'med_name': row.GoodsName or row.DrugCode or '',
@@ -247,6 +251,7 @@ def get_prescription_detail(prescription_id):
                 'type': '급여' if row.PS_Type in ['0', '4'] else '비급여' if row.PS_Type == '1' else row.PS_Type,
                 'sung_code': row.SUNG_CODE or '',
                 'ps_type': row.PS_Type or '0',
+                'unit_code': unit_code,
                 'is_substituted': is_substituted,
                 'original_drug': original_drug
             })