feat: implement page/post duplication, add event layout, auto-extract featured images, and include HTML escaping for templates.

sisvietnamvn_main/TestReplace.java

@@ -0,0 +1,10 @@
+import java.util.regex.Matcher;
+public class TestReplace {
+    public static void main(String[] args) {
+        String test = "Line 1\nLine 2";
+        System.out.println("Original:");
+        System.out.println(test);
+        System.out.println("Quote:");
+        System.out.println(Matcher.quoteReplacement(test));
+    }
+}