Add Repository URL Verification

[Naomi-Gift]

Projects can provide website metadata, but source repository ownership is not verified.
Acceptance criteria:
Add optional repository URL field.
Validate URL format.
Add verification evidence for repository ownership.
Tests cover repository URL add/update and invalid input.

[TheWeirdDee]

@TheWeirdDee has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I want to work on this because unverified repository URLs are a real trust gap in any project registry — anyone can claim ownership without proof. Adding verification evidence closes that properly.
I work on Web3 projects regularly where on-chain and off-chain ownership verification matters, so I understand the problem beyond just the implementation. I can handle the URL validation, verification logic, and test coverage end to end.

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

[drips-wave]

Congratulations, @dev-chinasa! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @dev-chinasa: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

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