Add template metadata support for license and repository URL

[Nanle-code]

Extend the template metadata model to include license, repository, homepage, and documentation links. Display these fields in template details and use them when building search/index outputs. This makes templates more transparent and trustworthy.

[KarenZita01]

@KarenZita01 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would love to take on this issue. I’ve reviewed the event ingestion logic. I have quite an experience with Rust, Soroban smart contracts and some other programming languages.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @KarenZita01 to this issue.

[Maxwell316]

@Maxwell316 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I can work on this issue, kindly assign me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Maxwell316 to this issue.

[drips-wave]

Congratulations, @Maxwell316! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @Maxwell316: 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.

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[drips-wave]

This issue has been completed by @Maxwell316 as part of the Stellar Wave Program's 5th Wave 🥳

😎 @Maxwell316: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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