feat: update version to 1.2.2; change OTA upgrade link in HTML files; enhance OTA upload handling with progress updates and JSON responses

html/rfid.html

@@ -21,7 +21,7 @@
             <a href="/waage">Scale</a>
             <a href="/spoolman">Spoolman/Bambu</a>
             <a href="/about">About</a>
-            <a href="/ota">Upgrade</a>
+            <a href="/upgrade">Upgrade</a>
         </nav>
         <div class="status-container">
             <div class="status-item">