feat: 新增RBAC角色模板复制与初始化

src/Application/TakeoutSaaS.Application/Identity/Handlers/ListRoleTemplatesQueryHandler.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Linq;
+using MediatR;
+using TakeoutSaaS.Application.Identity.Abstractions;
+using TakeoutSaaS.Application.Identity.Contracts;
+using TakeoutSaaS.Application.Identity.Queries;
+
+namespace TakeoutSaaS.Application.Identity.Handlers;
+
+/// <summary>
+/// 角色模板列表查询处理器。
+/// </summary>
+public sealed class ListRoleTemplatesQueryHandler(IRoleTemplateProvider roleTemplateProvider)
+    : IRequestHandler<ListRoleTemplatesQuery, IReadOnlyList<RoleTemplateDto>>
+{
+    /// <inheritdoc />
+    public Task<IReadOnlyList<RoleTemplateDto>> Handle(ListRoleTemplatesQuery request, CancellationToken cancellationToken)
+    {
+        var templates = roleTemplateProvider.GetTemplates()
+            .OrderBy(template => template.TemplateCode, StringComparer.OrdinalIgnoreCase)
+            .Select(TemplateMapper.ToDto)
+            .ToArray();
+
+        return Task.FromResult<IReadOnlyList<RoleTemplateDto>>(templates);
+    }
+}