feat: 인쇄에 투약주기/병용약 추가 + 인쇄 피드백 개선

- 인쇄 API: component_guide JOIN 추가
- 영수증에 ★ 투약 주기 ★ / ★ 함께 투약 권장 ★ 섹션 추가
- 인쇄 버튼: 로딩 중 → 인쇄 완료! 피드백
- 이모지 대신 ★ 사용 (프린터 호환)

backend/app.py

@@ -6446,17 +6446,24 @@ def api_animal_drug_info_print():
             with pg_engine.connect() as conn:
                 result = conn.execute(text("""
                     SELECT 
-                        product_name,
-                        company_name,
-                        main_ingredient,
-                        efficacy_effect,
-                        dosage_instructions,
-                        precautions,
-                        weight_min_kg,
-                        weight_max_kg,
-                        pet_size_label
-                    FROM apc 
-                    WHERE apc = :apc
+                        a.product_name,
+                        a.company_name,
+                        a.main_ingredient,
+                        a.efficacy_effect,
+                        a.dosage_instructions,
+                        a.precautions,
+                        a.weight_min_kg,
+                        a.weight_max_kg,
+                        a.pet_size_label,
+                        a.component_code,
+                        g.component_name_ko,
+                        g.dosing_interval_adult,
+                        g.dosing_interval_high_risk,
+                        g.dosing_interval_puppy,
+                        g.companion_drugs
+                    FROM apc a
+                    LEFT JOIN component_guide g ON a.component_code = g.component_code
+                    WHERE a.apc = :apc
                     LIMIT 1
                 """), {'apc': apc})
                 row = result.fetchone()
@@ -6591,6 +6598,27 @@ def api_animal_drug_info_print():
                 for line in wrap_text(para.strip(), 44):
                     message += f"  {line}\n"
         
+        # 투약 주기 (component_guide JOIN)
+        if row.dosing_interval_adult:
+            message += f"""
+{THIN}
+★ 투약 주기 ★
+"""
+            message += f"  일반: {row.dosing_interval_adult}\n"
+            if row.dosing_interval_high_risk:
+                message += f"  고위험: {row.dosing_interval_high_risk}\n"
+            if row.dosing_interval_puppy:
+                message += f"  새끼: {row.dosing_interval_puppy}\n"
+        
+        # 병용약 권장 (component_guide JOIN)
+        if row.companion_drugs:
+            message += f"""
+{THIN}
+★ 함께 투약 권장 ★
+"""
+            for line in wrap_text(row.companion_drugs, 44):
+                message += f"  {line}\n"
+        
         message += f"""
 {LINE}
                     청 춘 약 국

backend/templates/admin_products.html

@@ -1191,6 +1191,11 @@
     }
     
     async function printAnimalDrugSheet(apc) {
+        const btn = event.target;
+        const originalText = btn.innerHTML;
+        btn.disabled = true;
+        btn.innerHTML = '인쇄 중...';
+        
         try {
             const res = await fetch('/api/animal-drug-info/print', {
                 method: 'POST',
@@ -1200,13 +1205,20 @@
             const data = await res.json();
             
             if (data.success) {
-                alert('인쇄 완료!');
-                document.getElementById('animalDrugModal').remove();
+                btn.innerHTML = '✓ 인쇄 완료!';
+                btn.style.background = '#059669';
+                setTimeout(() => {
+                    document.getElementById('animalDrugModal')?.remove();
+                }, 1500);
             } else {
                 alert(`인쇄 실패: ${data.error}`);
+                btn.innerHTML = originalText;
+                btn.disabled = false;
             }
         } catch (err) {
             alert(`인쇄 오류: ${err.message}`);
+            btn.innerHTML = originalText;
+            btn.disabled = false;
         }
     }