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

app/globals.css

@@ -272,4 +272,38 @@
     color: var(--charcoal-brown);
     opacity: 0.8;
   }
+
+  .select-content {
+    background: var(--bone-white);
+    border: 1px solid var(--mocha-taupe);
+  }
+
+  .select-item {
+    color: var(--charcoal-brown);
+    transition: background 0.15s;
+  }
+
+  .select-item:hover,
+  .select-item[data-highlighted] {
+    background: var(--soft-cream);
+  }
+
+  .select-item[data-state="checked"] {
+    background: var(--soft-cream);
+    font-weight: 500;
+  }
+
+  .select-trigger {
+    background: var(--bone-white);
+    border: 1px solid var(--mocha-taupe);
+    color: var(--charcoal-brown);
+  }
+
+  .select-trigger:hover {
+    border-color: var(--deep-earth);
+  }
+
+  .select-trigger[data-state="open"] {
+    border-color: var(--deep-earth);
+  }
 }