Verify Phone Code

{
  "phone_number": "+255614853618",
  "verification_code": "123456"
}

{
  "success": true,
  "message": "Phone number verified successfully",
  "phone_number": "+255614853618",
  "phone_verified": true
}

{
  "success": false,
  "error": "Invalid verification code",
  "message": "The verification code provided is incorrect or expired",
  "attempts_remaining": 2
}