fix OTP verification error response

[saurabhhhcodes]

What changed

• Replaced the OTP verification failure response with a standard 401 status.
• Updated the message to incorrect OTP.

Why

• The previous response used a non-standard status code and referred to a password even though the endpoint validates an OTP.

Validation

• git diff --check
• node --check server/src/routes/auth.js

Closes #174

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