fix(stats): _load_stats_data() JSON 解析失败时备份损坏文件

- JSON 解析失败时将损坏文件重命名为 .corrupted.{timestamp}.bak
- 保留损坏文件以便后续分析和恢复
- 分离 JSONDecodeError 和 IOError 的处理逻辑

agents/haonan/workspace/dev-workflow/stats.py

@@ -34,7 +34,15 @@ def _load_stats_data() -> Dict[str, Any]:
     try:
         with open(STATS_FILE, 'r', encoding='utf-8') as f:
             return json.load(f)
-    except (json.JSONDecodeError, IOError):
+    except json.JSONDecodeError as e:
+        # 备份损坏的文件
+        backup_path = STATS_FILE.with_suffix(f'.corrupted.{datetime.now().strftime("%Y%m%d_%H%M%S")}.bak')
+        try:
+            STATS_FILE.rename(backup_path)
+        except OSError:
+            pass  # 备份失败时忽略
+        return {"events": [], "metadata": {"created_at": datetime.now().isoformat()}}
+    except IOError:
         return {"events": [], "metadata": {"created_at": datetime.now().isoformat()}}