fix: dedupe wechat chat history and avoid duplicate outbound chat logging

utils/wechat_chat_log.py

@@ -83,11 +83,17 @@ async def push_chat_to_wechat(
 
     # 附带近期对话，保持连贯
     recent = _get_recent_conversation(customer_id, acc_id, last_n=8)
+    last_line = None
     for m in recent:
         role = customer_id if m.get("direction") == "in" else "客服"
         msg = _truncate((m.get("message") or "").strip(), 120)
         if msg:
-            lines.append(f"{role}：{msg}")
+            line = f"{role}：{msg}"
+            # 防止日志中的重复记录在企微里连续刷屏
+            if line == last_line:
+                continue
+            lines.append(line)
+            last_line = line
     # 当前回复（可能已在 recent 中有客户消息，客服回复是新的）
     lines.append(f"客服：{reply_msg or '(无回复)'}")