fix(gateway): fix routing prefix matching and cache fallback tools

TestAnnotation.java

@@ -0,0 +1,25 @@
+import org.springframework.core.annotation.AnnotationUtils;
+import java.lang.annotation.*;
+import java.lang.reflect.Method;
+
+@Retention(RetentionPolicy.RUNTIME)
+@interface MyTool {
+    String value();
+}
+
+interface MyUseCase {
+    @MyTool("hello")
+    void doSomething();
+}
+
+class MyUseCaseImpl implements MyUseCase {
+    public void doSomething() { }
+}
+
+public class TestAnnotation {
+    public static void main(String[] args) throws Exception {
+        Method m = MyUseCaseImpl.class.getDeclaredMethod("doSomething");
+        MyTool ann = AnnotationUtils.findAnnotation(m, MyTool.class);
+        System.out.println("Annotation found: " + (ann != null ? ann.value() : "null"));
+    }
+}