feat: add timer log (#793)

## Description

<!--
Please include a summary of the changes below;
Fill in the issue number that this PR addresses (if applicable);
Fill in the related MemOS-Docs repository issue or PR link (if
applicable);
Mention the person who will review this PR (if you know who it is);
Replace (summary), (issue), (docs-issue-or-pr-link), and (reviewer) with
the appropriate information.

请在下方填写更改的摘要；
填写此 PR 解决的问题编号（如果适用）；
填写相关的 MemOS-Docs 仓库 issue 或 PR 链接（如果适用）；
提及将审查此 PR 的人（如果您知道是谁）；
替换 (summary)、(issue)、(docs-issue-or-pr-link) 和 (reviewer) 为适当的信息。
-->

Summary: (summary)

Fix: #(issue)

Docs Issue/PR: (docs-issue-or-pr-link)

Reviewer: @(reviewer)

## Checklist:

- [ ] I have performed a self-review of my own code | 我已自行检查了自己的代码
- [ ] I have commented my code in hard-to-understand areas |
我已在难以理解的地方对代码进行了注释
- [ ] I have added tests that prove my fix is effective or that my
feature works | 我已添加测试以证明我的修复有效或功能正常
- [ ] I have created related documentation issue/PR in
[MemOS-Docs](https://github.com/MemTensor/MemOS-Docs) (if applicable) |
我已在 [MemOS-Docs](https://github.com/MemTensor/MemOS-Docs) 中创建了相关的文档
issue/PR（如果适用）
- [ ] I have linked the issue to this PR (if applicable) | 我已将 issue
链接到此 PR（如果适用）
- [ ] I have mentioned the person who will review this PR | 我已提及将审查此 PR
的人

Author: CaralHsi

src/memos/utils.py

@@ -1,5 +1,6 @@
 import functools
 import time
+import traceback
 
 from memos.log import get_logger
 
@@ -35,6 +36,7 @@ def decorator(fn):
         def wrapper(*args, **kwargs):
             start = time.perf_counter()
             exc_type = None
+            exc_message = None
             result = None
             success_flag = False
 
@@ -44,6 +46,7 @@ def wrapper(*args, **kwargs):
                 return result
             except Exception as e:
                 exc_type = type(e)
+                exc_message = traceback.format_exc()
                 success_flag = False
 
                 if fallback is not None and callable(fallback):
@@ -76,13 +79,15 @@ def wrapper(*args, **kwargs):
 
                 status = "SUCCESS" if success_flag else "FAILED"
                 status_info = f", status: {status}"
-
                 if not success_flag and exc_type is not None:
-                    status_info += f", error: {exc_type.__name__}"
+                    status_info += (
+                        f", error_type: {exc_type.__name__}, error_message: {exc_message}"
+                    )
 
                 msg = (
                     f"[TIMER_WITH_STATUS] {log_prefix or fn.__name__} "
                     f"took {elapsed_ms:.0f} ms{status_info}, args: {ctx_str}"
+                    f", result: {result}"
                 )
 
                 logger.info(msg)