feat: add struts learning tracker

web/validation/success.jsp

@@ -81,6 +81,19 @@
             <a class="link-btn" href="form.jsp">Try validation again</a>
             <a class="link-btn" href="../index.jsp">Back to portal</a>
         </div>
+
+        <div class="stats">
+            <div class="stat">
+                <span>Rule path</span>
+                <strong>validate()</strong>
+                The action accepted every field, so execution continued to the success result.
+            </div>
+            <div class="stat">
+                <span>Teaching focus</span>
+                <strong>Input before logic</strong>
+                Compare this page with the form error state to explain why validation runs before business output.
+            </div>
+        </div>
     </div>
 </body>
 </html>