feat(login): Add verification code login functionality

- Add verification code login endpoint to support passwordless authentication via email or phone
- Add send login verification code endpoint to initiate verification code delivery
- Implement verificationCodeLogin method in LoginService to handle verification code authentication
- Implement sendLoginVerificationCode method in LoginService to send verification codes to users
- Add VerificationCodeLoginRequest and related DTOs to support new login flow
- Add VerificationCodeLoginDto and SendLoginVerificationCodeDto for API request validation
- Implement verificationCodeLogin and sendLoginVerificationCode in LoginCoreService
- Add comprehensive Swagger documentation for new endpoints with proper status codes and responses
- Support test mode for verification code delivery with 206 Partial Content status
- Fix UsersService dependency injection in test specifications to use string token
- Enhance authentication options by providing passwordless login alternative to traditional password-based authentication

src/dto/login.dto.ts

@@ -371,4 +371,57 @@ export class SendEmailVerificationDto {
   @IsEmail({}, { message: '邮箱格式不正确' })
   @IsNotEmpty({ message: '邮箱不能为空' })
   email: string;
+}
+
+/**
+ * 验证码登录请求DTO
+ */
+export class VerificationCodeLoginDto {
+  /**
+   * 登录标识符
+   * 支持邮箱或手机号登录
+   */
+  @ApiProperty({
+    description: '登录标识符，支持邮箱或手机号',
+    example: 'test@example.com',
+    minLength: 1,
+    maxLength: 100
+  })
+  @IsString({ message: '登录标识符必须是字符串' })
+  @IsNotEmpty({ message: '登录标识符不能为空' })
+  @Length(1, 100, { message: '登录标识符长度需在1-100字符之间' })
+  identifier: string;
+
+  /**
+   * 验证码
+   */
+  @ApiProperty({
+    description: '6位数字验证码',
+    example: '123456',
+    pattern: '^\\d{6}$'
+  })
+  @IsString({ message: '验证码必须是字符串' })
+  @IsNotEmpty({ message: '验证码不能为空' })
+  @Matches(/^\d{6}$/, { message: '验证码必须是6位数字' })
+  verification_code: string;
+}
+
+/**
+ * 发送登录验证码请求DTO
+ */
+export class SendLoginVerificationCodeDto {
+  /**
+   * 登录标识符
+   * 支持邮箱或手机号
+   */
+  @ApiProperty({
+    description: '登录标识符，支持邮箱或手机号',
+    example: 'test@example.com',
+    minLength: 1,
+    maxLength: 100
+  })
+  @IsString({ message: '登录标识符必须是字符串' })
+  @IsNotEmpty({ message: '登录标识符不能为空' })
+  @Length(1, 100, { message: '登录标识符长度需在1-100字符之间' })
+  identifier: string;
 }