fix issues

server/routes/messages.js

@@ -60,11 +60,17 @@ async function analyzeWithDeepSeek(text, historyMessages, username, isAdmin) {
   ];
   const content = await callDeepSeek(messages, 0.1);
   console.log('🤖 AI 返回:', content);
-  const parsed = JSON.parse(content.replace(/```json|```/g, '').trim());
-  normalize(parsed);
-  const v = validate(parsed);
-  if (!v.valid) console.warn('⚠️ AI 返回校验失败:', v.error);
-  return parsed;
+  try {
+    const parsed = JSON.parse(content.replace(/```json|```/g, '').trim());
+    normalize(parsed);
+    const v = validate(parsed);
+    if (!v.valid) console.warn('⚠️ AI 返回校验失败:', v.error);
+    return parsed;
+  } catch (e) {
+    // AI 返回非 JSON（如纯文本回复图片消息）→ 降级为 chat
+    console.warn('⚠️ AI 返回非 JSON，降级为 chat:', content.substring(0, 50));
+    return { action: 'chat', reply: content };
+  }
 }
 
 module.exports = router;