fix: remove duplicate and deprecated createService implementation

frontend/src/lib/components/admin/ServicesManagement.svelte

@@ -128,17 +128,31 @@
 	let creatingService = $state(false);
 
 	async function createService() {
+		updateAllErrors();
+
+		const hasErrors = Object.values(serviceErrors).some((error) => error !== '');
+		if (hasErrors) {
+			toast.error('Please fix the validation errors before submitting');
+			return;
+		}
+
+		if (!isFormValid) {
+			toast.error('Form validation failed');
+			return;
+		}
+
 		creatingService = true;
 		const loadingToast = toast.loading('Creating service...');
 
-		const payload = {
-			...newService,
-			price: Number(newService.price),
-			duration_minutes: Number(newService.duration_minutes),
-			minimum_age_required: Number(newService.minimum_age_required)
-		};
-
 		try {
+			const payload = {
+				name: newService.name.trim(),
+				description: newService.description.trim() || undefined,
+				price: Number(newService.price),
+				duration_minutes: Number(newService.duration_minutes),
+				minimum_age_required: Number(newService.minimum_age_required)
+			};
+
 			const response = await fetch('/api/admin/services', {
 				method: 'POST',
 				headers: {
@@ -173,6 +187,14 @@
 		}
 	}
 
+		} catch (err) {
+			console.error('Error creating service:', err);
+			toast.error('Network error creating service', { id: loadingToast });
+		} finally {
+			creatingService = false;
+		}
+	}
+
 	function resetServiceForm() {
 		newService = {
 			name: '',