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

lib/supabase/client.ts

@@ -6,16 +6,4 @@ const supabaseAnonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!
 // Public Supabase client for client-side operations
 export const supabase = createClient(supabaseUrl, supabaseAnonKey)
 
-// Admin Supabase client for server-side operations with service role
-export const supabaseAdmin = createClient(
-  supabaseUrl,
-  process.env.SUPABASE_SERVICE_ROLE_KEY!,
-  {
-    auth: {
-      autoRefreshToken: false,
-      persistSession: false
-    }
-  }
-)
-
 export default supabase