docs: 添加Postman配置文件和更新API文档

添加Postman环境配置和API集合文件，用于接口测试
更新README和API文档，补充部署说明和接口细节

docs/自动化营业额系统/Postman_Environment.json

@@ -0,0 +1,8 @@
+{
+  "id": "f6c3b3a1-3c2d-4b62-bc35-0c6ef873a001",
+  "name": "PushToZhaoShang-Env",
+  "values": [
+    { "key": "baseUrl", "value": "http://localhost:57778", "enabled": true },
+    { "key": "adminToken", "value": "", "enabled": true }
+  ]
+}