feat: Initial implementation of permission manager SDK - Add core permission management functionality with @RequiresPermission annotation - Implement permission checking aspect with Spring Security integration - Add comprehensive model classes for permissions, roles, and domains - Create integration builder for permission structure setup - Add configuration support for permission manager client - Implement exception handling for access control - Add extensive test coverage with integration tests - Configure Maven build with Spring Boot/Cloud dependencies

src/main/java/de/mummeit/pmg/exception/InvalidPermissionRequestException.java

@@ -0,0 +1,22 @@
+package de.mummeit.pmg.service.exception;
+
+/**
+ * Exception thrown when a permission request is invalid.
+ */
+public class InvalidPermissionRequestException extends PermissionManagerException {
+    private final String reason;
+
+    public InvalidPermissionRequestException(String message, String reason) {
+        super(message);
+        this.reason = reason;
+    }
+
+    public InvalidPermissionRequestException(String message, String reason, Throwable cause) {
+        super(message, cause);
+        this.reason = reason;
+    }
+
+    public String getReason() {
+        return reason;
+    }
+}