feat: rework admin portal with pricing breakdown and document management

- Added pricing snapshot columns to the leads table: daily_subtotal, weekend_subtotal, subtotal_eur, vat_eur, total_eur, deposit_eur, total_days, weekday_count, weekend_day_count.
- Updated create_lead RPC to accept and store new pricing parameters.
- Enhanced frontend app.js to compute and send pricing details during lead creation.
- Introduced new UI elements in admin.html for displaying pricing and documents in a tabbed dialog.
- Updated i18n.js with new translation keys for pricing and document management.
- Improved styles in styles.css for new dialog components and pricing cards.
- Added migration script 06-admin-pricing-documents.sql for database schema changes.

docker-compose.local.yml

@@ -20,6 +20,7 @@ services:
       - ./supabase/migrations/03-booking-flow.sql:/sql/03-booking-flow.sql:ro
       - ./supabase/migrations/04-kaution-weekend-km.sql:/sql/04-kaution-weekend-km.sql:ro
       - ./supabase/migrations/05-create-lead-rpc.sql:/sql/05-create-lead-rpc.sql:ro
+      - ./supabase/migrations/06-admin-pricing-documents.sql:/sql/06-admin-pricing-documents.sql:ro
 
   kong:
     volumes:
@@ -28,4 +29,4 @@ services:
   web:
     volumes:
       - ./frontend:/usr/share/nginx/html
-      - ./frontend/nginx.conf:/etc/nginx/conf.d/default.conf:ro
+      - ./frontend/nginx.conf:/etc/nginx/conf.d/default.conf:ro