refactor: ♻️ 框架&业务代码分离 (#185)

Co-authored-by: tk <fiyne1a@dingtalk.com>

src/backend/NetAdmin.Infrastructure/Attributes/DomainAttribute.cs

@@ -0,0 +1,13 @@
+namespace NetAdmin.Infrastructure.Attributes;
+
+/// <summary>
+///     域名特性
+/// </summary>
+[AttributeUsage(AttributeTargets.Field | AttributeTargets.Enum)]
+public sealed class DomainAttribute : Attribute
+{
+    /// <summary>
+    ///     主机名称
+    /// </summary>
+    public string HostName { get; init; }
+}