feat: 实现微信小程序后端接口与用户认证系统

新增微信登录/注册合一接口、资料完善接口和token刷新接口
重构用户服务层，支持自动维护用户类型和资料完整度
引入JWT认证中间件和请求验证中间件
更新文档与测试用例，支持dist构建部署

back-end/dist/src/index.js

@@ -0,0 +1,39 @@
+const express = require('express')
+const env = require('./config/env')
+const { fail } = require('./utils/response')
+const requestLogger = require('./middlewares/requestLogger')
+const errorHandler = require('./middlewares/errorHandler')
+const apiRoutes = require('./routes/apiRoutes')
+
+function createApp() {
+    const app = express()
+
+    app.use(express.json({ limit: '1mb' }))
+    app.use(requestLogger)
+
+    app.use(env.apiPrefix, apiRoutes)
+
+    app.use((req, res) => {
+        return fail(res, 404, 'Route not found', {
+            path: req.path,
+        })
+    })
+
+    app.use(errorHandler)
+
+    return app
+}
+
+if (require.main === module) {
+    const app = createApp()
+    app.listen(env.port, () => {
+        console.log(`Server running on port ${env.port}`)
+        console.log(`Public base URL: ${env.appBaseUrl}`)
+        console.log(`Test endpoint: ${env.appBaseUrl}${env.apiPrefix}/test-helloworld`)
+        console.log(`Health check: ${env.appBaseUrl}${env.apiPrefix}/health`)
+    })
+}
+
+module.exports = {
+    createApp,
+}