Add a new function `resolve_fiat_offer_price_for_user` to determine the correct offer price for users based on their subscription choices and any applicable discounts. Update payment handlers for CryptoPay, FreeKassa, Platega, SeverPay, and YooKassa to utilize this function, ensuring callback price validation and improving error handling for price mismatches. This enhances security by preventing callback payload tampering and ensures accurate pricing for users.
- Enhanced the display_subscription_options and reshow_subscription_options_callback functions to accept a promo_code_service parameter for improved discount handling.
- Updated the logic to calculate and display discounted prices based on active promo codes, including support for both regular and star-based pricing.
- Modified relevant locales to include currency symbols in discount notices for better user clarity.
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