Cashline: 관리자 대시보드의 탄생

Update the "Cashline" MVP requirements with a full Admin Dashboard and advanced withdrawal controls. Admin dashboard requirements (must build) 1) Users management - Admin can view a list of all users with: name, email, role, wallet address, created date, status (active, blocked) financial summary per user: confirmed deposits total, invested total, allocated profits total, available balance, queued withdrawals total - Admin can open a user profile page and see: a) Deposits list (pendin