feat: implement customer registration flow and business hours system

Major changes:
- Add customer registration with email/phone lookup (app/booking/registro)
- Add customers API endpoint (app/api/customers/route)
- Implement business hours for locations (mon-fri 10-7, sat 10-6, sun closed)
- Fix availability function type casting issues
- Add business hours utilities (lib/utils/business-hours.ts)
- Update Location type to include business_hours JSONB
- Add mock payment component for testing
- Remove Supabase auth from booking flow
- Fix /cita redirect path in booking flow

Database migrations:
- Add category column to services table
- Add business_hours JSONB column to locations table
- Fix availability functions with proper type casting
- Update get_detailed_availability to use business_hours

Features:
- Customer lookup by email or phone
- Auto-redirect to registration if customer not found
- Pre-fill customer data if exists
- Business hours per day of week
- Location-specific opening/closing times

scripts/test_availability_functions.sql

@@ -0,0 +1,24 @@
+-- Test the availability functions
+-- Execute in Supabase Dashboard: Database > SQL Editor
+
+-- Test check_staff_availability with fixed type casting
+SELECT 
+  check_staff_availability(
+    (SELECT id FROM staff LIMIT 1),
+    NOW() + INTERVAL '1 hour',
+    NOW() + INTERVAL '2 hours'
+  ) as is_available;
+
+-- Test get_detailed_availability with business hours
+SELECT * FROM get_detailed_availability(
+  (SELECT id FROM locations LIMIT 1),
+  (SELECT id FROM services LIMIT 1),
+  CURRENT_DATE + INTERVAL '1 day',
+  60
+);
+
+-- Check business hours structure
+SELECT name, business_hours FROM locations LIMIT 1;
+
+-- Check services with category
+SELECT id, name, category, is_active FROM services LIMIT 5;