feat: 이미지 교체 기능 추가

- URL 입력으로 이미지 수동 교체
- 다양한 User-Agent로 다운로드 시도 (차단 우회)
- base64 변환 + 썸네일 자동 생성
- status를 'manual'로 표시

backend/app.py

@@ -5782,6 +5782,115 @@ def api_delete_product_image(barcode):
         return jsonify({'success': False, 'error': str(e)}), 500
 
 
+@app.route('/api/admin/product-images/<barcode>/replace', methods=['POST'])
+def api_replace_product_image(barcode):
+    """이미지 URL로 교체"""
+    import sqlite3
+    import requests
+    import base64
+    from PIL import Image
+    from io import BytesIO
+    
+    try:
+        data = request.get_json()
+        image_url = data.get('image_url', '').strip()
+        
+        if not image_url:
+            return jsonify({'success': False, 'error': 'URL 필요'}), 400
+        
+        # 다양한 User-Agent와 헤더로 시도
+        headers_list = [
+            {
+                'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
+                'Accept': 'image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8',
+                'Accept-Language': 'ko-KR,ko;q=0.9,en-US;q=0.8,en;q=0.7',
+                'Referer': 'https://www.google.com/',
+            },
+            {
+                'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 16_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.0 Mobile/15E148 Safari/604.1',
+                'Accept': 'image/*,*/*;q=0.8',
+            },
+            {
+                'User-Agent': 'Googlebot-Image/1.0',
+            }
+        ]
+        
+        response = None
+        for headers in headers_list:
+            try:
+                response = requests.get(image_url, headers=headers, timeout=15, allow_redirects=True)
+                if response.status_code == 200 and len(response.content) > 1000:
+                    break
+            except:
+                continue
+        
+        if not response or response.status_code != 200:
+            return jsonify({'success': False, 'error': f'이미지 다운로드 실패 (상태: {response.status_code if response else "연결실패"})'}), 400
+        
+        # PIL로 이미지 처리
+        try:
+            img = Image.open(BytesIO(response.content))
+            
+            # RGBA -> RGB 변환
+            if img.mode == 'RGBA':
+                bg = Image.new('RGB', img.size, (255, 255, 255))
+                bg.paste(img, mask=img.split()[3])
+                img = bg
+            elif img.mode != 'RGB':
+                img = img.convert('RGB')
+            
+            # 리사이즈 (최대 500px)
+            max_size = 500
+            if max(img.size) > max_size:
+                ratio = max_size / max(img.size)
+                new_size = tuple(int(dim * ratio) for dim in img.size)
+                img = img.resize(new_size, Image.LANCZOS)
+            
+            # base64 변환
+            buffer = BytesIO()
+            img.save(buffer, format='JPEG', quality=85)
+            image_base64 = base64.b64encode(buffer.getvalue()).decode('utf-8')
+            
+            # 썸네일 생성
+            thumb_size = 100
+            ratio = thumb_size / max(img.size)
+            thumb_img = img.resize(tuple(int(dim * ratio) for dim in img.size), Image.LANCZOS)
+            thumb_buffer = BytesIO()
+            thumb_img.save(thumb_buffer, format='JPEG', quality=80)
+            thumbnail_base64 = base64.b64encode(thumb_buffer.getvalue()).decode('utf-8')
+            
+        except Exception as e:
+            return jsonify({'success': False, 'error': f'이미지 처리 실패: {str(e)}'}), 400
+        
+        # SQLite 업데이트
+        db_path = os.path.join(os.path.dirname(__file__), 'db', 'product_images.db')
+        conn = sqlite3.connect(db_path)
+        cursor = conn.cursor()
+        
+        cursor.execute("""
+            UPDATE product_images 
+            SET image_base64 = ?, thumbnail_base64 = ?, image_url = ?, 
+                status = 'manual', error_message = NULL, updated_at = datetime('now')
+            WHERE barcode = ?
+        """, (image_base64, thumbnail_base64, image_url, barcode))
+        
+        if cursor.rowcount == 0:
+            # 레코드가 없으면 새로 생성
+            cursor.execute("""
+                INSERT INTO product_images (barcode, image_base64, thumbnail_base64, image_url, status, product_name)
+                VALUES (?, ?, ?, ?, 'manual', ?)
+            """, (barcode, image_base64, thumbnail_base64, image_url, barcode))
+        
+        conn.commit()
+        conn.close()
+        
+        return jsonify({'success': True, 'message': '이미지 교체 완료'})
+        
+    except Exception as e:
+        logging.error(f"이미지 교체 오류: {e}")
+        return jsonify({'success': False, 'error': str(e)}), 500
+
+
 @app.route('/api/admin/product-images/stats')
 def api_product_images_stats():
     """이미지 통계"""