Revert "Add Anki Sync Server addon (self-hosted flashcard sync)"

This reverts commit 75baab8914.

menus/clone_settings.sh

@@ -65,7 +65,6 @@ clone_detect_addons() {
     command -v netbird &>/dev/null && addons+=("netbird")
     baresip_is_installed 2>/dev/null && addons+=("asterisk_intercom")
     webui_is_installed 2>/dev/null && addons+=("webui")
-    anki_sync_is_installed 2>/dev/null && addons+=("anki_sync")
 
     if sudo -u "$KIOSK_USER" test -f "$CONFIG_PATH" 2>/dev/null; then
         local authelia_url
@@ -244,13 +243,6 @@ action_apply_clone_settings() {
                 fi ;;
             asterisk_intercom)
                 echo "  [!] Asterisk Intercom - needs its own SIP extension on this device" ;;
-            anki_sync)
-                if anki_sync_is_installed; then
-                    echo "  [x] Anki Sync Server - already installed"
-                else
-                    echo "  [ ] Anki Sync Server - not installed, install via Addons"
-                    missing_any=true
-                fi ;;
             authelia)
                 echo "  [!] Authelia - needs a fresh login on this device" ;;
             *)