chore: add documentation comments and stylecop rules

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

@@ -16,6 +16,7 @@ public sealed class UpdateRoleCommandHandler(
 {
     public async Task<RoleDto?> Handle(UpdateRoleCommand request, CancellationToken cancellationToken)
     {
+        // 1. 获取租户上下文并查询角色
         var tenantId = tenantProvider.GetCurrentTenantId();
         var role = await roleRepository.FindByIdAsync(request.RoleId, tenantId, cancellationToken);
         if (role == null)
@@ -23,12 +24,15 @@ public sealed class UpdateRoleCommandHandler(
             return null;
         }
 
+        // 2. 更新字段
         role.Name = request.Name;
         role.Description = request.Description;
 
+        // 3. 持久化
         await roleRepository.UpdateAsync(role, cancellationToken);
         await roleRepository.SaveChangesAsync(cancellationToken);
 
+        // 4. 返回 DTO
         return new RoleDto
         {
             Id = role.Id,