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Discount Scope Rules

Discounts now support two explicit application scopes:
  1. Total purchase
    • Applies to registration rates, products, and custom amount fields.
    • Discount calculations include organizer fees (before tax).
    • If the discount amount exceeds the sum of items, the remaining value reduces organizer fees.
  2. Rates only
    • Applies exclusively to registration rates.
    • Products, booking add-ons, and custom amount inputs remain untouched.
    • Organizer fees are not affected.
If neither flag is selected (legacy data), the behaviour matches the previous implementation: the discount targets the sum of cart items but not organizer fees. This keeps historical discounts working without changes. When creating or editing a discount, the UI enforces mutual exclusivity between the two options and defaults to Total purchase for new entries.