goldenChat base source add

backend/src/main/java/com/goldenchart/auth/UserRole.java

@@ -0,0 +1,16 @@
+package com.goldenchart.auth;
+
+public enum UserRole {
+    ADMIN,
+    USER,
+    GUEST;
+
+    public static UserRole fromString(String value) {
+        if (value == null || value.isBlank()) return USER;
+        try {
+            return UserRole.valueOf(value.trim().toUpperCase());
+        } catch (IllegalArgumentException e) {
+            return USER;
+        }
+    }
+}