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/scripts/build.js

@@ -0,0 +1,52 @@
+const fs = require('fs')
+const path = require('path')
+
+const rootDir = path.resolve(__dirname, '..')
+const distDir = path.join(rootDir, 'dist')
+const sourceDirs = ['src', 'spec']
+const sourceFiles = ['package.json', 'package-lock.json', '.env', 'eslint.config.js']
+
+function ensureCleanDir(dirPath) {
+    fs.rmSync(dirPath, { recursive: true, force: true })
+    fs.mkdirSync(dirPath, { recursive: true })
+}
+
+function copyRecursive(sourcePath, targetPath) {
+    const stats = fs.statSync(sourcePath)
+
+    if (stats.isDirectory()) {
+        fs.mkdirSync(targetPath, { recursive: true })
+        for (const entry of fs.readdirSync(sourcePath)) {
+            copyRecursive(
+                path.join(sourcePath, entry),
+                path.join(targetPath, entry)
+            )
+        }
+        return
+    }
+
+    fs.mkdirSync(path.dirname(targetPath), { recursive: true })
+    fs.copyFileSync(sourcePath, targetPath)
+}
+
+function build() {
+    ensureCleanDir(distDir)
+
+    for (const dir of sourceDirs) {
+        const sourcePath = path.join(rootDir, dir)
+        if (fs.existsSync(sourcePath)) {
+            copyRecursive(sourcePath, path.join(distDir, dir))
+        }
+    }
+
+    for (const file of sourceFiles) {
+        const sourcePath = path.join(rootDir, file)
+        if (fs.existsSync(sourcePath)) {
+            copyRecursive(sourcePath, path.join(distDir, file))
+        }
+    }
+
+    console.log('Build completed. Deployable files generated in dist/.')
+}
+
+build()