fix: 验证码不刷新问题修复，项目包结构调整

src/main/java/com/youlai/system/plugin/captcha/CaptchaModel.java

@@ -0,0 +1,24 @@
+package com.youlai.system.plugin.captcha;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * 验证码对象
+ */
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class CaptchaModel {
+    /**
+     * 验证码编码
+     */
+    private String code;
+
+    /**
+     * 验证码图片Base64
+     */
+    private String base64;
+
+}