fix(message_summary): format workflow token usage

plugins/message_summary/main.py

@@ -305,10 +305,28 @@ class MessageSummaryPlugin(MessagePluginInterface):
         if not usage:
             return answer
 
-        prompt_tokens = usage.get("prompt_tokens", 0)
-        completion_tokens = usage.get("completion_tokens", 0)
-        total_tokens = usage.get("total_tokens", 0)
-        tokens_info = f"\n\n【tokens】输入: {prompt_tokens} 生成: {completion_tokens} 总: {total_tokens}"
+        prompt_tokens = usage.get("prompt_tokens")
+        completion_tokens = usage.get("completion_tokens")
+        total_tokens = usage.get("total_tokens")
+        latency = usage.get("latency")
+
+        info_parts = []
+        # chat-messages 风格的明细
+        if prompt_tokens is not None and completion_tokens is not None:
+            info_parts.append(f"输入: {prompt_tokens}")
+            info_parts.append(f"生成: {completion_tokens}")
+
+        # workflow 常见只有 total_tokens
+        if total_tokens is not None:
+            info_parts.append(f"总: {total_tokens}")
+
+        if latency is not None:
+            info_parts.append(f"耗时: {latency}s")
+
+        if not info_parts:
+            return answer
+
+        tokens_info = "\n\n【tokens】" + " ".join(info_parts)
         return answer + tokens_info
 
     def _clean_summary_output(self, answer: str) -> str: