test: 添加测试环境信息文档

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

doc/test-data/purchase_transaction/TEST_ENV.md

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+# 测试环境信息
+
+## 测试日期
+2026-02-08
+
+## 后端服务
+- URL: http://localhost:8080
+- Swagger: http://localhost:8080/swagger-ui/index.html
+
+## 测试账号
+- username: admin
+- password: admin123
+
+## 测试接口
+1. 导入: POST /ccdi/purchaseTransaction/importData
+2. 查询状态: GET /ccdi/purchaseTransaction/importStatus/{taskId}
+3. 查询失败记录: GET /ccdi/purchaseTransaction/importFailures/{taskId}
+
+## 测试数据文件
+- purchase_test_data_2000.xlsx (2000条测试数据)