重构后端服务架构并优化前端错误处理

go-backend/README.md

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+# Go Backend for Niumall
+
+This is the Go implementation of the Niumall backend using the Gin framework.
+
+## Project Structure
+
+```
+go-backend/
+├── README.md
+├── go.mod
+├── go.sum
+├── main.go
+├── config/
+├── models/
+├── routes/
+├── controllers/
+├── middleware/
+├── utils/
+└── docs/
+```
+
+## Getting Started
+
+1. Install Go (version 1.16 or later)
+2. Run `go mod tidy` to install dependencies
+3. Run `go run main.go` to start the server
+
+## API Documentation
+
+API documentation is available in the `docs/` directory.