增加图片验证码接口

src/main/java/cn/iocoder/dashboard/framework/captcha/config/CaptchaConfig.java

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+package cn.iocoder.dashboard.framework.captcha.config;
+
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableConfigurationProperties(CaptchaProperties.class)
+public class CaptchaConfig {
+}

src/main/java/cn/iocoder/dashboard/framework/captcha/config/CaptchaProperties.java

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+package cn.iocoder.dashboard.framework.captcha.config;
+
+import lombok.Data;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.validation.annotation.Validated;
+
+import javax.validation.constraints.NotNull;
+import java.time.Duration;
+
+@ConfigurationProperties(prefix = "yudao.captcha")
+@Validated
+@Data
+public class CaptchaProperties {
+
+    /**
+     * 验证码的过期时间
+     */
+    @NotNull(message = "验证码的过期时间不为空")
+    private Duration timeout;
+    /**
+     * 验证码的高度
+     */
+    @NotNull(message = "验证码的高度不能为空")
+    private Integer height;
+    /**
+     * 验证码的宽度
+     */
+    @NotNull(message = "验证码的宽度不能为空")
+    private Integer width;
+
+}

src/main/java/cn/iocoder/dashboard/framework/captcha/package-info.java

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+/**
+ * 基于 Hutool captcha 库，实现验证码功能
+ */
+package cn.iocoder.dashboard.framework.captcha;