feat: add sponsor floating button to all pages site-wide

- Add sponsor.js: standalone KakaoPay FAB using absolute QR URL
- Refactor community.js: delegate FAB to sponsor.js, remove duplicate code
- Inject sponsor.js into 172 pages missing it (roadmap, hig-playground, .en.html tutorials)
- FAB shows ☕ 후원하기 button fixed bottom-right on every page
- QR modal opens on click with KakaoPay QR code

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: M1zz

site/accessorysetupkit/01-tutorial.en.html

@@ -515,4 +515,5 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body></html>

site/activitykit/01-delivery-tracker.en.html

@@ -365,5 +365,6 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body>
 </html>

site/alarmkit/01-tutorial.en.html

@@ -731,4 +731,5 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body></html>

site/appintents/01-siri-todo-app.en.html

@@ -179,4 +179,5 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body></html>

site/arkit/01-ar-furniture-app.en.html

@@ -466,4 +466,5 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body></html>

site/authservices/01-tutorial.en.html

@@ -357,5 +357,6 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body>
 </html>

site/avfoundation/01-tutorial.en.html

@@ -676,4 +676,5 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body></html>

site/avkit/01-tutorial.en.html

@@ -666,4 +666,5 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body></html>

site/bluetooth/01-ble-device-scanner.en.html

@@ -565,4 +565,5 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body></html>

site/callkit/01-tutorial.en.html

@@ -605,5 +605,6 @@ <h2 style="font-size:20px;margin-bottom:12px;">📎 Apple Official Resources</h2
   </div>
 </div>
 </article>
+<script src="../sponsor.js"></script>
 </body>
 </html>