debug: purchase 分支和 POST 入口加 attachments 日志

- POST /api/rooms/:roomId/messages 入口打印收到的 attachments
- handleAIResult purchase 分支开头打印 attachments 值
- 用于定位附件关联失败的具体环节

server/server.js

@@ -163,6 +163,7 @@ app.get('/api/rooms/:roomId/messages', auth, (req, res) => {
 
 app.post('/api/rooms/:roomId/messages', auth, async (req, res) => {
   const { text, attachments } = req.body;
+  console.log('📨 收到消息, text:', (text||'').substring(0,30), 'attachments:', JSON.stringify(attachments));
   const roomId = req.params.roomId;
   const username = req.user.username;
   const now = timestamp();
@@ -439,6 +440,7 @@ function handleAIResult(aiResult, roomId, username, originalText, attachments) {
     return;
   }
   if (aiResult.action === 'purchase') {
+    console.log('🛒 purchase 分支, attachments:', JSON.stringify(attachments));
     // 引用最近图片：用户要求把之前的图片关联到某采购
     let usedRecentImage = false;
     if (aiResult.use_recent_image) {