fix(admin): pagination, patch tests, and per-page limits

Backend:
- Fix GetAllAdminBookingsHandler and SearchAdminBookingsHandler to
  return totalPages in response
- Auto-record patch tests when booking status progresses to "completed"
- Add GET/POST /api/admin/users/{id}/patch-tests endpoints
  Frontend:
- BookingsCard: proper pagination with 4 per page, prev/next buttons
- UsersCard, BookingCreateModal, WalkInCreateModal: per_page=4 for user
  search
- Add PatchTestModal for manual patch test entry in UserModal
- Hide patch test section when user has no eligible services
  Database:
- Add UNIQUE constraint on user_service_patch_tests(user_id, service_id)

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

@@ -4,6 +4,7 @@
 	import { toast } from 'svelte-sonner';
 	import * as Modal from '$lib/components/ui/dialog';
 	import { Button } from '$lib/components/ui/button';
+	import PatchTestModal from './PatchTestModal.svelte';
 
 	interface Props {
 		open: boolean;
@@ -68,6 +69,9 @@
 	let totalBookingPages = $state(1);
 	let loadingBookings = $state(false);
 
+	let showPatchTestModal = $state(false);
+	let hasEligiblePatchTests = $state(false);
+
 	async function fetchUserDetails() {
 		if (!userId) return;
 
@@ -92,6 +96,32 @@
 		}
 	}
 
+	async function fetchEligiblePatchTests() {
+		if (!userId) return;
+		try {
+			const response = await fetch(`/api/admin/users/${userId}/patch-tests/eligible`, {
+				method: 'GET',
+				headers: {
+					'Content-Type': 'application/json',
+					Authorization: `Bearer ${authStore.currentToken}`
+				}
+			});
+			if (response.ok) {
+				const services = await response.json();
+				hasEligiblePatchTests = services.length > 0;
+			}
+		} catch (err) {
+			console.error('Error fetching eligible patch tests:', err);
+		}
+	}
+
+	$effect(() => {
+		if (userId) {
+			fetchUserDetails();
+			fetchEligiblePatchTests();
+		}
+	});
+
 	async function fetchUserBookings(page: number = 1) {
 		if (!userId) return;
 
@@ -99,7 +129,7 @@
 		try {
 			const params = new URLSearchParams({
 				page: page.toString(),
-				per_page: '5'
+				per_page: '4'
 			});
 
 			const response = await fetch(`/api/admin/bookings/user/${userId}?${params}`, {
@@ -279,6 +309,24 @@
 					{/if}
 				</div>
 
+				{#if hasEligiblePatchTests}
+				<!-- Patch Test Actions -->
+				<div class="rounded-lg border border-gray-200 bg-gray-50 p-4">
+					<h3 class="mb-3 text-sm font-semibold tracking-wide text-gray-600 uppercase">
+						Patch Tests
+					</h3>
+					<p class="mb-3 text-sm text-gray-600">
+						Record patch test completion to allow this user to book services requiring one.
+					</p>
+					<Button variant="outline" onclick={() => (showPatchTestModal = true)}>
+						<svg xmlns="http://www.w3.org/2000/svg" class="mr-2 h-4 w-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+							<path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"/>
+						</svg>
+						Record Patch Test
+					</Button>
+				</div>
+				{/if}
+
 				<!-- Loyalty & Referrals -->
 				<div class="rounded-lg border border-gray-200 bg-gray-50 p-4">
 					<h3 class="mb-3 text-sm font-semibold tracking-wide text-gray-600 uppercase">
@@ -454,3 +502,14 @@
 		</Modal.Footer>
 	</Modal.Content>
 </Modal.Root>
+
+{#if selectedUser}
+	<PatchTestModal
+		bind:open={showPatchTestModal}
+		userId={selectedUser.id}
+		userName={selectedUser.fullName}
+		onPatchTestAdded={() => {
+			fetchUserDetails();
+		}}
+	/>
+{/if}