feat: 동물약만 보기 체크박스 필터 추가

- 검색창 옆에 '🐾 동물약만 보기' 체크박스
- animal_only 파라미터로 API 필터링
- POS_BOON='010103' 기준 필터

backend/templates/admin_products.html

@@ -356,8 +356,16 @@
                        onkeypress="if(event.key==='Enter')searchProducts()">
                 <button class="search-btn" onclick="searchProducts()">🔍 검색</button>
             </div>
-            <div class="search-hint">
-                <span>예시</span> 타이레놀, 벤포파워, 8806418067510, LB000001423
+            <div style="display: flex; justify-content: space-between; align-items: center; margin-top: 12px;">
+                <div class="search-hint">
+                    <span>예시</span> 타이레놀, 벤포파워, 8806418067510, LB000001423
+                </div>
+                <label style="display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 14px; color: #475569;">
+                    <input type="checkbox" id="animalOnly" style="width: 18px; height: 18px; accent-color: #10b981; cursor: pointer;">
+                    <span style="display: flex; align-items: center; gap: 4px;">
+                        🐾 <strong style="color: #10b981;">동물약만</strong> 보기
+                    </span>
+                </label>
             </div>
         </div>
 
@@ -441,7 +449,8 @@
         const tbody = document.getElementById('productsTableBody');
         tbody.innerHTML = '<tr><td colspan="5" class="empty-state"><p>검색 중...</p></td></tr>';
 
-        fetch(`/api/products?search=${encodeURIComponent(search)}`)
+        const animalOnly = document.getElementById('animalOnly').checked;
+        fetch(`/api/products?search=${encodeURIComponent(search)}${animalOnly ? '&animal_only=1' : ''}`)
             .then(res => res.json())
             .then(data => {
                 if (data.success) {