Can I vibe code Booxi?

Build a headless retail appointment scheduling system built with Next.js App Router, Prisma ORM, PostgreSQL, and Tailwind UI, designed to replace Booxi for a multi-location merchant on Shopify.

CORE DATA MODEL:
1. Organization (id, name, slug)
2. StoreLocation (id, orgId, name, timezone, address, shopifyLocationId)
3. StaffMember (id, storeLocationId, name, email, googleCalendarTokens, outlookCalendarTokens, schedule)
4. Service (id, orgId, name, durationMinutes, price, currency, bufferBefore, bufferAfter, isGroup, maxCapacity)
5. Booking (id, storeLocationId, serviceId, staffMemberId, customerEmail, customerPhone, customerName, startTime, endTime, status, shopifyOrderId, shopifyCustomerId)

REQUIRED FEATURES:
1. Embeddable Booking Widget:
   - Modern React component that can be embedded via iframe or direct JS script on Shopify storefronts.
   - Flow: Select Location -> Select Service -> Select Staff (or 'Any Available') -> Select Date/Time Slot -> Customer Details -> Confirmation.
   - Time slot generation logic must dynamically calculate open slots based on: Store Hours, Staff Shift Schedules, Existing Bookings, Service Buffers (before/after), and real-time external calendar busy times.

2. Shopify Integrations:
   - Shopify Admin App extension to view store bookings alongside orders.
   - Shopify POS Tile Extension: Allows store staff using Shopify POS on iPad to view daily appointment schedules, check-in customers, and attach booked services to a POS cart.
   - Customer Webhook handler: Automatically associate bookings with Shopify Customer IDs via email matching or create new Shopify Customers.

3. Two-Way External Calendar Sync:
   - Integration with Google Calendar API and Microsoft Graph API (Outlook).
   - Sync created bookings to staff external calendars.
   - Block internal time slots when external calendars report 'Busy' events.

4. Notifications:
   - Send transactional booking confirmation and reminder emails via Resend API.
   - Send SMS reminders via Twilio API 24 hours prior to appointment time.

OUT OF SCOPE:
- Native mobile apps (web-only POS extension).
- Complex group ticketing payment gateways outside of Shopify Checkout.
- Multi-language auto-translation engine.

FAILURE MODES TO HANDLE:
- Race conditions: Prevent double-booking same time slot/staff member using PostgreSQL row-level locks or transactional reservation locks during slot selection.
- Timezone conversions: Store all timestamps in UTC, handle local conversions explicitly based on StoreLocation timezone, not client browser timezone.

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