feat(src/djinit/templates/project/frontend): use .jsx entry point in frontend template

The templates now reference a React entry script; switching from .js to .jsx ensures the compiled asset is correctly loaded and improves template fidelity, preventing missing script errors.

Enhancements
- Updated index.html‑tpl to reference `/src/main.jsx` instead of `/src/main.js`
- Normalized line endings for both index‑vue.html‑tpl and index.html‑tpl

src/djinit/templates/project/frontend/index-vue.html-tpl

@@ -9,4 +9,4 @@
     <div id="app"></div>
     <script type="module" src="/src/main.js"></script>
   </body>
-</html>
+</html>

src/djinit/templates/project/frontend/index.html-tpl

@@ -9,4 +9,4 @@
     <div id="root"></div>
     <script type="module" src="/src/main.jsx"></script>
   </body>
-</html>
+</html>