Fix image path in LLM answers

frontend/main.js

@@ -266,7 +266,14 @@ class MultimodalAssistant {
         // Pattern: ![alt text](image_url)
         formattedContent = formattedContent.replace(
             /!\[(.*?)\]\((.*?)\)/g,
-            '<br><img src="$2" alt="$1" class="max-w-md rounded-lg shadow-md my-4" /><br>'
+            (match, alt, url) => {
+                // 如果是 images/ 开头的路径，转换为 /product_images/
+                let correctedUrl = url;
+                if (url.startsWith('images/')) {
+                    correctedUrl = url.replace('images/', '/product_images/');
+                }
+                return `<br><img src="${correctedUrl}" alt="${alt}" class="max-w-md rounded-lg shadow-md my-4" onerror="this.src='https://via.placeholder.com/300?text=Image+Not+Found'" /><br>`;
+            }
         );
 
         if (answerContent) answerContent.innerHTML = formattedContent;