feat: update default rolesClaim to 'roles' for Logto compatibility

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-core/src/main/java/com/cameleer3/server/core/security/OidcConfig.java

@@ -25,6 +25,6 @@ public record OidcConfig(
         String displayNameClaim
 ) {
     public static OidcConfig disabled() {
-        return new OidcConfig(false, "", "", "", "realm_access.roles", List.of("VIEWER"), true, "name");
+        return new OidcConfig(false, "", "", "", "roles", List.of("VIEWER"), true, "name");
     }
 }