[FUNCTION] implement `calculate_platform_fee`

[Akshola00]

[FUNCTION] implement calculate_platform_fee

• Title: Create a internal platform fee calculator.
• Description: Calculate a % fee based on a donation amount.
• Requirements:
  • Support basis points (e.g., 250 bps for 2.5%).
  • Test: Verify calculation for small and large amounts (avoiding overflow).

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[Benalex8797]

@Benalex8797 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

hi maintainer, please i will like to work on this issue

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Congratulations, @Benalex8797! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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