refs #722: externalize backoffice customer configuration

src/main/java/com/cloudhandson/vpdbackoffice/config/MaskingProperties.java

@@ -0,0 +1,8 @@
+package com.cloudhandson.vpdbackoffice.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+/** JSON configuration of database redaction policies this backoffice is allowed to manage. */
+@ConfigurationProperties(prefix = "backoffice.masking")
+public record MaskingProperties(String policies) {
+}