Fix signup parsing error when verificationCodeTimeout is empty

When verificationCodeTimeout config is missing or empty, GetConfigInt64
returns an error "parsing '': invalid syntax". This error was propagating
to the signup flow, causing signup with Email OTP to fail.

This fix provides a default value of 10 minutes (matching the value in
app.conf) when the config is missing, following the same pattern used in
timeout_filter.go.

Co-authored-by: nomeguy <85475922+nomeguy@users.noreply.github.com>

object/verification.go

@@ -281,7 +281,7 @@ func CheckVerificationCode(dest string, code string, lang string) (*VerifyResult
 
 	timeoutInMinutes, err := conf.GetConfigInt64("verificationCodeTimeout")
 	if err != nil {
-		return nil, err
+		timeoutInMinutes = 10
 	}
 
 	now := time.Now().Unix()