[Soroban] Admin Contract Configuration

[Eniola3321]

Labels

soroban admin enhancement

Summary

Allow admins to update global contract settings.

Background

Platform fee and default royalty values should be configurable without redeployment.

Tasks
Add set_platform_fee().
Add set_default_royalty().
Emit ConfigUpdated.
Restrict to contract owner.
Swagger / API Integration
Document admin configuration endpoints.
Add request/response examples.
Acceptance Criteria

Only owner can update config.

Changes are emitted as events.

[olawale880]

please can i work on the issue

[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #702)
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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@olawale880's PR #723 was approved and merged by @Eniola3321.

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👏 Great work, @olawale880! Keep contributing to ANYTECHS.