Fix/auth middleware type error 2

[Muhamadmust]

PR: Fix TypeScript Type-Check Errors in authMiddleware (#725)

Description

Fixes a CI build failure triggered during the pnpm run type-check phase. The error stems from an explicit type mismatch where a createdAt timestamp property was included in an object literal that strictly defines user attributes without it.

Changes Implemented

• Updated src/lib/authMiddleware.ts: Removed the invalid createdAt property from the user object literals near lines 47 and 63.
• Aligned Object Schemas: Strict alignment ensured across user types containing id, name, email, role, referralCount, referralCode, and referredBy.

Verification Checklist

• Local type validation via pnpm run type-check succeeds with no errors.
• Code structurally complies with TypeScript compiler rules without using any-casts.

Closes #725