chore: 初始化 TFS 2013 工作项批量导入工具集

- TfsExcelImporter: WinForms 桌面版，走 TFS Client OM（本环境 wit REST 路由 404，OM 是唯一可行通道）
- tfs_import.py: REST 版命令行导入器，供 wit 接口可用的 TFS 实例使用
- templates: Excel 导入模板及其 OOXML 源部件
- README: 两套工具定位、配置、环境坑点与验证方式
- 真实台账与本机工作笔记不入库，仅提交 work_items.example.csv 说明列结构

TfsExcelImporter/config.json

@@ -0,0 +1,20 @@
+{
+  "TfsUrl": "http://pdtsf01.dev.goldenstand.cn:8080/tfs/DefaultCollection",
+  "Project": "Tools_Dev",
+  "WorkItemType": "Product Backlog Item",
+  "IterationPath": "",
+  "AreaPath": "Tools_Dev\\DataTechnologies",
+  "AuthMode": "ntlm",
+  "Username": "",
+  "Password": "",
+  "Domain": "",
+  "UseSystemProxy": false,
+  "BypassRules": true,
+  "SkipExistingTitles": true,
+  "DefaultState": "To Do",
+  "FinancialProjectRef": "",
+  "CompletedRef": "",
+  "LogDateRef": "",
+  "LastExcelPath": "",
+  "ParentPbiId": ""
+}