Add repository URL validation and metadata fetching

[Naomi-Gift]

Problem
Project detail includes a GitHub button, but the app does not collect or validate repository URLs consistently.
Suggested fix
Add repository URL to project submission, validate supported hosts, and optionally fetch basic metadata such as stars, license, and last update.
Acceptance criteria
Repository URL can be added and edited.
Invalid repository URLs show clear errors.
Project detail can display basic repository metadata when available.

[chiscookeke11]

@chiscookeke11 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would love to take on this issue, kindly assign to me

Interested in taking this on. I’ve worked across smart contracts, APIs, and frontend integrations, and I can start immediately.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @chiscookeke11 to this issue.

[Hunter-baddie]

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

Please can I be assigned this issue?

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

[Chigybillionz]

I can take this up and deliver a fix. Please assign.

Thank you very much as you do so for me !!

[charityzarmai]

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

Hi maintainer please kindly assign this issue to me thank you

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

[Zarmaijemimah]

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

I’ll love to work on this issue please kindly thank you

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

[drips-wave]

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

🧑‍💻 @Zarmaijemimah: 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.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@Zarmaijemimah's PR #174 was approved and merged by @Iwueseiter.

🏆 @Zarmaijemimah: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (153 total points). Track your full progress on GrantFox.

👏 Great work, @Zarmaijemimah! Keep contributing to HubDApp.