feat: add serial number visibility methods to Configure* OTP operations

Add SetSerialNumberApiVisible, SetSerialNumberButtonVisible, and
SetSerialNumberUsbVisible methods to all Configure* operation classes:
- ConfigureYubicoOtp
- ConfigureHotp
- ConfigureStaticPassword
- ConfigureChallengeResponse
- ConfigureNdef

These methods were previously only available in UpdateSlot, preventing
users from setting serial number visibility when initially configuring
an OTP slot. The new methods follow the existing pattern and delegate
to OtpSettings<T> for implementation.

Also added unit tests for the new methods in ConfigureYubicoOtpTests
to verify they return the correct instance for method chaining.

Author: DennisDyallo

Yubico.YubiKey/src/Yubico/YubiKey/Otp/Operations/ConfigureChallengeResponse.cs

@@ -313,6 +313,21 @@ public ConfigureChallengeResponse SetAllowUpdate(bool setConfig = true) =>
         /// <returns>The current <see cref="ConfigureChallengeResponse"/> instance.</returns>
         public ConfigureChallengeResponse UseButton(bool setConfig = true) =>
             Settings.UseButtonTrigger(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberApiVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureChallengeResponse"/> instance.</returns>
+        public ConfigureChallengeResponse SetSerialNumberApiVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberApiVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberButtonVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureChallengeResponse"/> instance.</returns>
+        public ConfigureChallengeResponse SetSerialNumberButtonVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberButtonVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberUsbVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureChallengeResponse"/> instance.</returns>
+        public ConfigureChallengeResponse SetSerialNumberUsbVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberUsbVisible(setConfig);
         #endregion
         #endregion
     }

Yubico.YubiKey/src/Yubico/YubiKey/Otp/Operations/ConfigureHotp.cs

@@ -262,6 +262,21 @@ public ConfigureHotp UseFastTrigger(bool setConfig = true) =>
         /// <returns>The current <see cref="ConfigureHotp"/> instance.</returns>
         public ConfigureHotp SendReferenceString(bool setConfig = true) =>
             Settings.SendReferenceString(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberApiVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureHotp"/> instance.</returns>
+        public ConfigureHotp SetSerialNumberApiVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberApiVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberButtonVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureHotp"/> instance.</returns>
+        public ConfigureHotp SetSerialNumberButtonVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberButtonVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberUsbVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureHotp"/> instance.</returns>
+        public ConfigureHotp SetSerialNumberUsbVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberUsbVisible(setConfig);
         #endregion
         #endregion
 

Yubico.YubiKey/src/Yubico/YubiKey/Otp/Operations/ConfigureNdef.cs

@@ -177,5 +177,22 @@ public ConfigureNdef WithLanguage(string languageCode)
             _languageCode = languageCode;
             return this;
         }
+
+        #region Flags to Relay
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberApiVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureNdef"/> instance.</returns>
+        public ConfigureNdef SetSerialNumberApiVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberApiVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberButtonVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureNdef"/> instance.</returns>
+        public ConfigureNdef SetSerialNumberButtonVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberButtonVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberUsbVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureNdef"/> instance.</returns>
+        public ConfigureNdef SetSerialNumberUsbVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberUsbVisible(setConfig);
+        #endregion
     }
 }

Yubico.YubiKey/src/Yubico/YubiKey/Otp/Operations/ConfigureStaticPassword.cs

@@ -327,6 +327,21 @@ public ConfigureStaticPassword SetAllowUpdate(bool setConfig = true) =>
         /// <inheritdoc cref="OtpSettings{T}.AllowManualUpdate(bool)"/>
         public ConfigureStaticPassword AllowManualUpdate(bool setConfig = true) =>
             Settings.AllowManualUpdate(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberApiVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureStaticPassword"/> instance.</returns>
+        public ConfigureStaticPassword SetSerialNumberApiVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberApiVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberButtonVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureStaticPassword"/> instance.</returns>
+        public ConfigureStaticPassword SetSerialNumberButtonVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberButtonVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberUsbVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureStaticPassword"/> instance.</returns>
+        public ConfigureStaticPassword SetSerialNumberUsbVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberUsbVisible(setConfig);
         #endregion
         #endregion
 

Yubico.YubiKey/src/Yubico/YubiKey/Otp/Operations/ConfigureYubicoOtp.cs

@@ -456,6 +456,21 @@ public ConfigureYubicoOtp SetAllowUpdate(bool setConfig = true) =>
         /// <returns>The current <see cref="ConfigureYubicoOtp"/> instance.</returns>
         public ConfigureYubicoOtp SendReferenceString(bool setConfig = true) =>
             Settings.SendReferenceString(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberApiVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureYubicoOtp"/> instance.</returns>
+        public ConfigureYubicoOtp SetSerialNumberApiVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberApiVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberButtonVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureYubicoOtp"/> instance.</returns>
+        public ConfigureYubicoOtp SetSerialNumberButtonVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberButtonVisible(setConfig);
+
+        /// <inheritdoc cref="OtpSettings{T}.SetSerialNumberUsbVisible(bool)"/>
+        /// <returns>The current <see cref="ConfigureYubicoOtp"/> instance.</returns>
+        public ConfigureYubicoOtp SetSerialNumberUsbVisible(bool setConfig = true) =>
+            Settings.SetSerialNumberUsbVisible(setConfig);
         #endregion
         #endregion
     }

Yubico.YubiKey/tests/unit/Yubico/YubiKey/Otp/Operations/ConfigureYubicoOtpTests.cs

@@ -59,6 +59,27 @@ public void TestSpecifiedAndGeneratedKey()
             Assert.Equal(ExceptionMessages.CantSpecifyKeyAndGenerate, ex.Message);
         }
 
+        [Fact]
+        public void TestSetSerialNumberApiVisible_ReturnsInstance()
+        {
+            ConfigureYubicoOtp result = _op.SetSerialNumberApiVisible(true);
+            Assert.Same(_op, result);
+        }
+
+        [Fact]
+        public void TestSetSerialNumberButtonVisible_ReturnsInstance()
+        {
+            ConfigureYubicoOtp result = _op.SetSerialNumberButtonVisible(true);
+            Assert.Same(_op, result);
+        }
+
+        [Fact]
+        public void TestSetSerialNumberUsbVisible_ReturnsInstance()
+        {
+            ConfigureYubicoOtp result = _op.SetSerialNumberUsbVisible(true);
+            Assert.Same(_op, result);
+        }
+
         protected virtual void Dispose(bool disposing)
         {
             if (!_disposedValue)