ensure global detection for empty route patterns

Author: Ericthilen

src/main/java/org/example/server/FilterRegistration.java

@@ -0,0 +1,14 @@
+package org.example.server;
+
+import java.util.List;
+
+public record FilterRegistration(
+        HttpFilter filter,
+        int order,
+        List<String> routePatterns // null/empty = global
+) {
+
+    public boolean isGlobal() {
+        return routePatterns == null || routePatterns.isEmpty();
+    }
+}