新增用户管理和个人信息功能，支持CRUD操作和密码修改

internal/middleware/auth.go

@@ -51,6 +51,18 @@ func ParseToken(tokenStr string) (*Claims, error) {
 	return nil, jwt.ErrSignatureInvalid
 }
 
+func AdminMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		role, _ := c.Get("role")
+		if role != "admin" {
+			c.JSON(http.StatusForbidden, gin.H{"error": "无权限访问"})
+			c.Abort()
+			return
+		}
+		c.Next()
+	}
+}
+
 func AuthMiddleware() gin.HandlerFunc {
 	return func(c *gin.Context) {
 		authHeader := c.GetHeader("Authorization")