feat: introduce v2.0 abstraction layer with core types, backend interface, and plugin system

feat: add fade effects with API control and real-time event subscription
test: add API integration tests with isolated test environment and coverage reporting
build: update Makefile for recursive source finding, dynamic linking, and test targets
docs: document abstraction layer, fade effects, and API enhancements in README

tests/js/script.js

@@ -0,0 +1,9 @@
+// JavaScript for enhanced security and interactivity
+
+// Example: Prevent form submission for demonstration
+document.querySelectorAll('form').forEach(form => {
+  form.addEventListener('submit', function(event) {
+    event.preventDefault();
+    alert('Form submission is disabled for security reasons.');
+  });
+});