feat(bookings): improve admin booking wizard and user dashboard

Backend:
- Enriched GetAllUserBookings response with calculated total_amount,
  amount_paid, and duration_minutes.
- Refactored GetBookingHandler to return a flat booking object matching
  frontend expectations.
- Added account_role to admin user list response and sorted users by
  booking activity.
- Corrected function name oo to AdminCreateBookingForUserHandler.

Frontend:
- Rebuilt BookingCreateModal into a 4-step wizard supporting guest
  bookings, service overrides, and real-time availability checks.
- Fixed account dashboard logic to correctly identify upcoming vs past
  bookings and sort unpaid items to the top.
- Extracted booking flow into a shared BookingFlow component.
- Redirected admin users from home page to /today.

frontend/src/lib/components/booking/StepIndicator.svelte

@@ -0,0 +1,39 @@
+<script lang="ts">
+	export let currentStep: number;
+	export let steps: string[] = ['Service', 'Date & Time', 'Details', 'Payment'];
+
+	const totalSteps = steps.length;
+</script>
+
+<div class="mb-8 grid grid-cols-2 gap-4 md:flex md:items-center md:justify-center md:space-x-4">
+	{#each steps as step, index (step)}
+		{@const stepNumber = index + 1}
+		{@const isActive = stepNumber <= currentStep}
+		{@const isLastStep = index === totalSteps - 1}
+
+		<div class="flex items-center justify-start md:justify-center">
+			<!-- Step circle -->
+			<div
+				class="flex h-8 w-8 items-center justify-center rounded-full text-sm font-medium {isActive
+					? 'bg-primary text-primary-foreground'
+					: 'bg-gray-200 text-gray-600'}"
+			>
+				{stepNumber}
+			</div>
+
+			<!-- Step label -->
+			<span class="ml-2 text-sm font-medium {isActive ? 'text-primary' : 'text-gray-600'}">
+				{step}
+			</span>
+
+			<!-- Connector line (desktop only, not after last step) -->
+			{#if !isLastStep}
+				<div
+					class="mx-4 hidden h-0.5 w-8 md:block {stepNumber < currentStep
+						? 'bg-primary'
+						: 'bg-gray-200'}"
+				></div>
+			{/if}
+		</div>
+	{/each}
+</div>