update 优化api,gateway,auth代码结构

ruoyi-auth/src/main/java/org/dromara/auth/controller/CaptchaController.java

@@ -59,11 +59,13 @@ public class CaptchaController {
         // 生成验证码
         CaptchaType captchaType = captchaProperties.getType();
         boolean isMath = CaptchaType.MATH == captchaType;
+        //如果是则拿取数字验证码位数，如果不是则拿取字符验证码长度
         Integer length = isMath ? captchaProperties.getNumberLength() : captchaProperties.getCharLength();
         CodeGenerator codeGenerator = ReflectUtils.newInstance(captchaType.getClazz(), length);
         AbstractCaptcha captcha = SpringUtils.getBean(captchaProperties.getCategory().getClazz());
         captcha.setGenerator(codeGenerator);
         captcha.createCode();
+        // 如果是数学验证码，使用SpEL表达式处理验证码结果
         String code = captcha.getCode();
         if (isMath) {
             ExpressionParser parser = new SpelExpressionParser();