Services can now have variable pricing where:
- Final price is determined after service completion
- A deposit (fixed amount or percentage) is collected at booking
- Customer's saved payment method is charged for remaining balance
Changes:
- Add variable_pricing, deposit_amount, deposit_percent fields to Service model
- Add service FK and final_price fields to Event model
- Add AWAITING_PAYMENT status to Event
- Add SetFinalPriceView endpoint to charge customer's saved card
- Add EventPricingInfoView endpoint for pricing details
- Update Services page with variable pricing toggle and deposit config
- Show "From $X" and deposit info in customer preview
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Co-Authored-By: Claude <noreply@anthropic.com>
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