docs: Add remote update screenshots to Gallery

Add 3 new screenshots showing the remote update workflow:
- Update Available, Remote Update, Updated Successfully

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -249,6 +249,12 @@ sudo ~/mc-webui/scripts/updater/install.sh --uninstall
     <td align="center"><a href="gallery/device_info.png"><img src="gallery/device_info.png" width="150"><br>Device Info</a></td>
     <td align="center"><a href="gallery/update_check.png"><img src="gallery/update_check.png" width="150"><br>Update Check</a></td>
   </tr>
+  <tr>
+    <td align="center"><a href="gallery/update_available.png"><img src="gallery/update_available.png" width="150"><br>Update Available</a></td>
+    <td align="center"><a href="gallery/remote_update.png"><img src="gallery/remote_update.png" width="150"><br>Remote Update</a></td>
+    <td align="center"><a href="gallery/updated_successfully.png"><img src="gallery/updated_successfully.png" width="150"><br>Updated Successfully</a></td>
+    <td></td>
+  </tr>
   <tr>
     <td align="center"><a href="gallery/contact_management.png"><img src="gallery/contact_management.png" width="150"><br>Contact Management</a></td>
     <td align="center"><a href="gallery/existing_contacts.png"><img src="gallery/existing_contacts.png" width="150"><br>Existing Contacts</a></td>