feat(member): add message reach backend module and docs seeds

src/Application/TakeoutSaaS.Application/App/Members/MessageReach/Options/MemberMessagingOptions.cs

@@ -0,0 +1,21 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace TakeoutSaaS.Application.App.Members.MessageReach.Options;
+
+/// <summary>
+/// 会员消息模块配置。
+/// </summary>
+public sealed class MemberMessagingOptions
+{
+    /// <summary>
+    /// 会员消息短信场景码。
+    /// </summary>
+    [Required]
+    public string SmsScene { get; set; } = "member_message";
+
+    /// <summary>
+    /// 微信小程序发送配置。
+    /// </summary>
+    [Required]
+    public MemberMessagingWeChatMiniOptions WeChatMini { get; set; } = new();
+}