feat：添加验证码调试功能

- 在验证码服务中添加debugCodeInfo方法
- 在业务层添加debugVerificationCode调试接口
- 新增/auth/debug-verification-code调试端点
- 支持查看验证码详细状态信息（TTL、尝试次数等）
- 便于开发和生产环境问题排查

src/business/login/login.controller.ts

@@ -343,4 +343,23 @@ export class LoginController {
   async resendEmailVerification(@Body() sendEmailVerificationDto: SendEmailVerificationDto): Promise<ApiResponse<{ verification_code?: string }>> {
     return await this.loginService.resendEmailVerification(sendEmailVerificationDto.email);
   }
+
+  /**
+   * 调试验证码信息
+   * 仅用于开发和调试
+   * 
+   * @param sendEmailVerificationDto 邮箱信息
+   * @returns 验证码调试信息
+   */
+  @ApiOperation({ 
+    summary: '调试验证码信息', 
+    description: '获取验证码的详细调试信息（仅开发环境）' 
+  })
+  @ApiBody({ type: SendEmailVerificationDto })
+  @Post('debug-verification-code')
+  @HttpCode(HttpStatus.OK)
+  @UsePipes(new ValidationPipe({ transform: true }))
+  async debugVerificationCode(@Body() sendEmailVerificationDto: SendEmailVerificationDto): Promise<any> {
+    return await this.loginService.debugVerificationCode(sendEmailVerificationDto.email);
+  }
 }