Return Base Reserve on Expiration

[phertyameen]

Goal

Ensure reserve is returned when account expires.

Problem

Expiration logic does not currently include reserve return.

Scope

Expiration Flow

• Include stored reserve in returned funds.
• Transfer to recovery address.
• Mark reserve as reclaimed or clear storage.

Safety

• Prevent double-return.
• Handle zero-balance edge cases.

Acceptance Criteria

• Expiration returns payment funds + reserve.
• Storage cleared appropriately.
• Tests cover expiration scenario.

⚠️ Contributor Note

This change affects account lifecycle and balance safety.

Please:

• Avoid implementing based solely on AI-generated patterns.
• Verify Stellar/Soroban minimum balance requirements independently.
• Ensure correct stroop calculations and edge-case handling.
• Confirm no invariant violations or unintended balance locks occur.
• Incorrect reserve handling can permanently lock funds.

[Cybermaxi7]

Hi @phertyameen
This is also something i can work on
Can i take this up?