[medium] Extract shared origin-validation logic into permission-service

[davedumto]

Summary

Origin validation logic is currently duplicated between the extension background worker and permission-service, violating DRY.

Requirements

• Extract the shared validation logic into permission-service as the source of truth
• Update the extension to call the shared logic rather than reimplementing it
• Add tests verifying both call sites produce identical validation results
• Remove the now-duplicated implementation from the extension

[lockoabosede8-byte]

@lockoabosede8-byte has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I would like to to solve this issue.

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[veloura-dev]

@veloura-dev has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

please maintainer can you pls assign this issue to me ..expect pr asap without errors

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[Nuelthewave]

@Nuelthewave has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer! i can easily resolve this issue. i would appreciate if i'm appointed to work on it.

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

[drips-wave]

Congratulations, @Nuelthewave! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Nuelthewave: 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

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