Create a Grant Expiration Management System

[Abd-Standard]

Description:
Automatically identify grants that have passed their deadline and update their availability status.

Acceptance Criteria:

Expired grants are automatically detected.
Expired grants are clearly marked.
Expired grants are excluded from active listings when appropriate.

[coderolisa]

Hello maintainer let me work on this
please assign

[grantfox-oss]

🦊 GrantFox — @coderolisa has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #155)
2. Your PR will be reviewed by the Core-Foundry maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

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

@coderolisa's PR #176 was approved and merged by @Abd-Standard.

🏆 @coderolisa: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,678 total points). Track your full progress on GrantFox.

👏 Great work, @coderolisa! Keep contributing to Core-Foundry.