新增：新增修改邮箱功能，并优化部分以往代码（引入 spring-boot-starter-mail 用于发送邮件验证码）

continew-admin-common/src/main/java/top/charles7c/cnadmin/common/model/vo/CaptchaVO.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package top.charles7c.cnadmin.common.model.vo;
+
+import java.io.Serializable;
+
+import lombok.Data;
+import lombok.experimental.Accessors;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+/**
+ * 验证码信息
+ *
+ * @author Charles7c
+ * @since 2022/12/11 13:55
+ */
+@Data
+@Accessors(chain = true)
+@Schema(description = "验证码信息")
+public class CaptchaVO implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * 验证码标识
+     */
+    @Schema(description = "验证码标识")
+    private String uuid;
+
+    /**
+     * 验证码图片（Base64编码，带图片格式：data:image/gif;base64）
+     */
+    @Schema(description = "验证码图片（Base64编码，带图片格式：data:image/gif;base64）")
+    private String img;
+}