remove Worker URL field from Steam settings

Removed Cloudflare Worker URL input field and info text from
SettingsDetailPage. Backend URL is now configured via environment
variable VITE_API_URL, not in UI.

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

src/pages/Settings/SettingsDetailPage.tsx

@@ -307,26 +307,6 @@ export default function SettingsDetailPage() {
 									}}
 								/>
 							</IonItem>
-							<IonItem>
-								<IonLabel position="stacked">
-									Cloudflare Worker URL (optional)
-								</IonLabel>
-								<IonInput
-									type="url"
-									placeholder="https://whattoplay-api.username.workers.dev"
-									value={config.workerUrl || ""}
-									onIonChange={(e) =>
-										setConfig({ ...config, workerUrl: e.detail.value || "" })
-									}
-								/>
-							</IonItem>
-							<IonItem lines="none">
-								<IonText color="medium">
-									<small>
-										Nur für Production. In Dev wird lokaler Server genutzt.
-									</small>
-								</IonText>
-							</IonItem>
 						</IonList>
 						<div className="settings-detail-actions">
 							<IonButton