添加项目文件。

Entities/DTO/ApiResponse.cs

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+namespace TechHelper.Services
+{
+	public class ApiResponse
+	{
+		public ApiResponse(string message, bool status = false)
+		{
+			this.Message = message;
+			this.Status = status;
+		}
+
+		public ApiResponse(bool status, object result)
+		{
+			this.Status = status;
+			this.Result = result;
+		}
+
+		public string Message { get; set; }
+
+		public bool Status { get; set; }
+
+		public object Result { get; set; }
+	}
+}

Entities/DTO/AuthResponseDto.cs

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+namespace Entities.DTO
+{
+    public class AuthResponseDto
+	{
+		public bool IsAuthSuccessful { get; set; }
+		public string? ErrorMessage { get; set; }
+		public string? Token { get; set; }
+		public string? RefreshToken { get; set; }
+		public bool Is2StepVerificationRequired { get; set; }	
+		public string Provider { get; set; }	
+	}
+}

Entities/DTO/ClassDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+	public class ClassDto
+	{
+		public byte Class { get; set; }
+
+		[StringLength(50, ErrorMessage = "班级名称不能超过 50 个字符。")]
+		public string Name { get; set; }
+
+		[Required(ErrorMessage = "年级是必填项。")]
+		[Range(1, 12, ErrorMessage = "年级编号必须在 1 到 12 之间。")] 
+		public byte Grade { get; set; }
+
+		public string Description { get; set; } = "HELLO WORLD";
+
+
+		public int? HeadTeacherId { get; set; }
+	}
+}

Entities/DTO/ForgotPasswordDto.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class ForgotPasswordDto
+	{
+		[Required]
+		[EmailAddress]
+		public string Email { get; set; }
+		public string ClientURI { get; set; }
+	}
+}

Entities/DTO/RefreshTokenDto.cs

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+namespace Entities.DTO
+{
+    public class RefreshTokenDto
+	{
+		public string? Token { get; set; }
+		public string? RefreshToken { get; set; }
+	}
+}

Entities/DTO/ResetPasswordDto.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class ResetPasswordDto
+	{
+		[Required(ErrorMessage = "Password is required")]
+		public string Password { get; set; }
+
+		[Compare(nameof(Password), ErrorMessage = "The password and confirmation password do not match")]
+		public string ConfirmPassword {  get; set; }
+
+		public string Email { get; set; }
+
+		public string Token { get; set; }
+	}
+}

Entities/DTO/ResetPasswordResponseDto.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class ResetPasswordResponseDto
+	{
+		public bool IsResetPasswordSuccessful { get; set; }	
+		public IEnumerable<string> Errors { get; set; } = Enumerable.Empty<string>();
+	}
+}

Entities/DTO/ResponseDto.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class ResponseDto
+	{
+		public bool IsSuccessfulRegistration { get; set; }
+		public IEnumerable<string> Errors { get; set; } = Enumerable.Empty<string>();
+	}
+}

Entities/DTO/TwoFactorVerificationDto.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class TwoFactorVerificationDto
+	{
+		public string Email { get; set; }	
+		public string Provider { get; set; }
+		[Required(ErrorMessage = "Token is required")]
+		public string TwoFactorToken { get; set; }
+	}
+}

Entities/DTO/UserForAuthenticationDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Entities.DTO
+{
+    public class UserForAuthenticationDto
+	{
+		[Required(ErrorMessage = "Email is required")]
+		public string? Email { get; set; }
+		[Required(ErrorMessage = "Password is required")]
+		public string? Password { get; set; }
+	}
+}

Entities/DTO/UserForRegistrationDto.cs

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+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class UserForRegistrationDto
+	{
+		[Required(ErrorMessage = "姓名是必填项。")]
+		[StringLength(50, MinimumLength = 2, ErrorMessage = "姓名长度必须在 2 到 50 个字符之间。")]
+		public string Name { get; set; }
+
+		[Required(ErrorMessage = "电子邮件是必填项。")]
+		[EmailAddress(ErrorMessage = "电子邮件格式不正确。")] // 添加 Email 格式验证
+		public string Email { get; set; }
+
+		[Required(ErrorMessage = "密码是必填项。")]
+		[StringLength(100, MinimumLength = 6, ErrorMessage = "密码长度至少为 6 个字符。")] // 确保长度验证
+		[RegularExpression(@"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&.])[A-Za-z\d@$!%*?&.]{6,}$",
+		 ErrorMessage = "密码必须包含至少一个大写字母、一个小写字母、一个数字和一个特殊字符。特殊字符包含 @$!%*?&. ")]
+		public string Password { get; set; }
+
+		[Compare(nameof(Password), ErrorMessage = "密码和确认密码不匹配。")]
+		[Required(ErrorMessage = "确认密码是必填项。")] // 确保确认密码也必须填写
+		public string ConfirmPassword { get; set; }
+
+		[Required(ErrorMessage = "至少选择一个角色。")]
+		public UserRoles Roles { get; set; } = UserRoles.Student; // 根据你当前的 MudRadioGroup 设定，这里是单选
+
+		[Required(ErrorMessage = "班级是必填项。")]
+		[Range(1, 14, ErrorMessage = "班级编号必须在 1 到 14 之间。")] // 班级范围已调整为 1-14
+		public int Class { get; set; } = 1;
+
+		[Required(ErrorMessage = "年级是必填项。")]
+		[Range(1, 6, ErrorMessage = "年级编号必须在 1 到 6 之间。")] // 年级范围已调整为 1-6
+		public int Grade { get; set; } = 1;
+
+		[Phone(ErrorMessage = "电话号码格式不正确。")]
+		[StringLength(11, MinimumLength = 11, ErrorMessage = "电话号码必须是 11 位数字。")] // 电话号码长度已调整为固定 11 位
+		public string PhoneNumber { get; set; }
+
+		[StringLength(200, ErrorMessage = "家庭住址不能超过 200 个字符。")]
+		public string HomeAddress { get; set; }
+
+		public string ClientURI { get; set; }	
+	}
+}

Entities/DTO/UserRegistrationToClassDto.cs

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+using Entities.Contracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.DTO
+{
+	public class UserRegistrationToClassDto
+	{
+		public string User { get; set; }
+		public byte ClassId { get; set; }
+		public byte GradeId { get; set; }
+		public UserRoles Roles { get; set; } = UserRoles.Student;
+		public SubjectAreaEnum SubjectArea { get; set; } = SubjectAreaEnum.Unknown;
+	}
+}