feat: enhance booking flow with BPF wizard, weekend pricing, and document uploads

- Updated translations for German and English to reflect changes in deposit terminology.
- Modified index.html to implement a new booking flow with a step-by-step wizard for vehicle selection, contact details, and ID verification.
- Added CSS styles for the new booking flow interface, including responsive design and improved input styles.
- Created new database policies and tables for handling customer and lead attachments during the booking process.
- Introduced weekend pricing and daily KM limits for vehicles in the database schema.
- Implemented email-based customer upsert functionality to streamline lead qualification and attachment transfer.

Co-authored-by: Copilot <copilot@github.com>

docker-compose.yml

@@ -209,6 +209,7 @@ services:
     volumes:
       - /mnt/user/appdata/mc-cars/supabase/migrations/post-boot.sql:/sql/post-boot.sql:ro
       - /mnt/user/appdata/mc-cars/supabase/migrations/02-leads.sql:/sql/02-leads.sql:ro
+      - /mnt/user/appdata/mc-cars/supabase/migrations/03-booking-flow.sql:/sql/03-booking-flow.sql:ro
     entrypoint: ["sh","-c"]
     command:
       - |
@@ -227,6 +228,7 @@ services:
              -v admin_password="$$ADMIN_PASSWORD" \
              -f /sql/post-boot.sql
         psql "postgresql://postgres:$$PGPASSWORD@db:5432/postgres" -v ON_ERROR_STOP=1 -f /sql/02-leads.sql
+        psql "postgresql://postgres:$$PGPASSWORD@db:5432/postgres" -v ON_ERROR_STOP=1 -f /sql/03-booking-flow.sql
         echo "post-init done."
     restart: "no"
     networks: [mccars]