feat: add TypeScript lessons and learning panel

- Introduced a new script to check TypeScript lesson files for errors.
- Created a main TypeScript file to render lessons and their details.
- Added lesson definitions with starter and answer codes.
- Implemented a user interface for navigating and running lessons.
- Styled the application with CSS for a better user experience.
- Updated README to reflect the new TypeScript section and usage instructions.

04-dom-events-async/01-query-selectors/answer.js

@@ -0,0 +1,7 @@
+const title = document.getElementById("page-title");
+const button = document.querySelector(".start-btn");
+const cards = document.querySelectorAll(".card");
+
+console.log("标题：", title.textContent);
+console.log("按钮：", button.textContent);
+console.log("卡片数量：", cards.length);