[Soroban] Fee treasury contract — accumulate and batch-withdraw platform fees

[Xaxxoo]

Overview

Create a treasury contract that accumulates platform fee income and allows admin-controlled batch withdrawals to minimise transaction overhead.

Tasks

• Accept USDC fee deposits from escrow contract
• Track total accumulated and per-period balances
• Implement withdraw(amount, destination) multisig-only function
• Emit TreasuryDeposit and TreasuryWithdrawal events
• Add get_balance() view function
• Unit test accumulation and withdrawal

Acceptance Criteria

• Treasury accumulates fees over time from multiple payments
• Only multisig can withdraw — single admin cannot drain alone

[menawar]

@menawar has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

can i work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @menawar to this issue.

[drips-wave]

Congratulations, @dreamgenies! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @dreamgenies: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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