[Backend] -- Implement KYC Document Upload and Verification

[Devsol-01]

Description:
Complete KYC module with secure document upload, verification workflow, and third-party verification provider integration.

Acceptance Criteria:

• Implement secure file upload
• Add document type validation
• Integrate with KYC provider API
• Create verification workflow
• Implement admin review interface
• Add verification status tracking
• Store documents securely with encryption

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[charliechinedu19-netizen]

@charliechinedu19-netizen has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hey gm, i'd love to take on this issue real quick

ℹ️ Repo Maintainers: To accept this application, review their application or assign @charliechinedu19-netizen to this issue.

[dhareymu]

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

Hi maintainer
This issue seems feasible to be fixed before the deadline today. Please, kindly assign it to me for a swift job.

Thank you

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

[dijangh904]

@dijangh904 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

i would love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @dijangh904 to this issue.

[drips-wave]

Congratulations, @dijangh904! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @dijangh904: 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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