Submit KYC Documents Endpoint

[grantfox-oss]

Description:
Allow users to submit their KYC documents for admin review.

Tasks:

• Create KYC schema/model: src/models/KYC.model.js with fields: userId, documentType, documentUrl, status, submittedAt, reviewedAt, reviewNote
• Create POST /api/users/me/kyc
• Require authentication; check that user hasn't already submitted or been approved
• Accept document upload (PDF/JPG/PNG) and save reference
• Set kycStatus on User to pending

Acceptance Criteria:
Users can submit KYC; duplicate submissions are rejected.

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[mubking]

please i would like to work on this issue

[mubking]

please i would like to work on this issue

[SudiptaPaul-31]

May I be assigned to this issue please my name is Sudipta Paul a active open source contributor with more than 50+ merged pr's and also an active contributor of GrantFox from beginning and would love to work on this issue and get a pr merged.
ETA : 2days