Admin: Get All Users (Paginated)

[grantfox-oss]

Description:
Allow admins to retrieve a paginated list of all users.

Tasks:

• Create GET /api/admin/users
• Require admin role
• Support query params: page, limit, search (by name/email), role, kycStatus
• Return paginated response: { data, total, page, totalPages }

Acceptance Criteria:
Admin can paginate and filter users; non-admins receive 403.

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[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