Fix SpoolBuddy update check comparing against GitHub releases instead of backend version

The SpoolBuddy daemon update endpoint fetched GitHub releases and compared
  them against device.firmware_version, which always showed "up to date"
  because the comparison source was wrong. Now compares directly against
  APP_VERSION from the running backend, so a daemon at 0.2.3b1 correctly
  sees 0.2.3 as an available update.

frontend/src/api/client.ts

@@ -4992,7 +4992,6 @@ export interface DaemonUpdateCheck {
   current_version: string;
   latest_version: string | null;
   update_available: boolean;
-  release_url: string | null;
 }
 
 // SpoolBuddy API
@@ -5027,8 +5026,8 @@ export const spoolbuddyApi = {
       body: JSON.stringify({ brightness, blank_timeout: blankTimeout }),
     }),
 
-  checkDaemonUpdate: (deviceId: string, includeBeta?: boolean) =>
-    request<DaemonUpdateCheck>(`/spoolbuddy/devices/${deviceId}/update-check?include_beta=${includeBeta ?? false}`),
+  checkDaemonUpdate: (deviceId: string) =>
+    request<DaemonUpdateCheck>(`/spoolbuddy/devices/${deviceId}/update-check`),
 
   triggerUpdate: (deviceId: string) =>
     request<{ status: string; message: string }>(`/spoolbuddy/devices/${deviceId}/update`, {