test: add tests for verification (OTP attempts/resend), notification service/repo, and invite flows

[cypriannwokolo2-creator]

Summary

verification/service.go (OTP attempts, resend), notification/service.go + repository, and invite flows lack tests.

Acceptance Criteria

• OTP attempt-count/expiry/resend tests
• Notification create/list/mark-read tests
• Invite create/accept/expiry tests

Complexity

Medium-High.

[Stephan-Thomas]

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

Hi, i would like to work on this.

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[Theraxia]

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

hi, i want to work on this, thanks maintainer

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[pixels26]

@pixels26 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer, I'd love to fix this issue

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[redman7712]

@redman7712 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer! I'm a senior developer with experience building high-quality, production-ready software. I'd love to take on this issue and deliver a clean, well-tested solution that aligns with the project's standards. Please assign it to me—I'm ready to get started and contribute effectively.

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[Adjutant500]

@Adjutant500 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer please I will like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Adjutant500 to this issue.