feat: add interfaces for VLAN and PoE management in network switches

src/PepperDash.Essentials.Core/DeviceTypeInterfaces/INetworkSwitchControl.cs

@@ -0,0 +1,48 @@
+namespace PepperDash.Essentials.Core.DeviceTypeInterfaces
+{
+    /// <summary>
+    /// Interface for network switches that support VLAN assignment on individual ports.
+    /// </summary>
+    public interface INetworkSwitchVlanManager
+    {
+        /// <summary>
+        /// Returns the current access VLAN ID configured on the port.
+        /// Return -1 when the value is unavailable (e.g. the switch has not been polled yet
+        /// or the implementation does not support VLAN queries).
+        /// </summary>
+        /// <param name="port">Switch port identifier</param>
+        /// <returns>VLAN ID or -1 when unavailable</returns>
+        int GetPortCurrentVlan(string port);
+
+        /// <summary>
+        /// Changes the access VLAN of a single switch port.
+        /// The implementation is responsible for entering/exiting privileged/config mode.
+        /// </summary>
+        /// <param name="port">Switch port identifier (e.g. "1/0/3" for Netgear, "gi1/0/3" for Cisco)</param>
+        /// <param name="vlanId">Target VLAN ID (1-4093)</param>
+        void SetPortVlan(string port, uint vlanId);
+    }
+
+    /// <summary>
+    /// Interface for network switches that support Power over Ethernet (PoE) control on individual ports.
+    /// </summary>
+    public interface INetworkSwitchPoeManager
+    {
+        /// <summary>
+        /// Enables or disables PoE power delivery on a single switch port.
+        /// The implementation is responsible for entering/exiting privileged/config mode.
+        /// </summary>
+        /// <param name="port">Switch port identifier</param>
+        /// <param name="enabled">True to enable PoE; false to disable PoE</param>
+        void SetPortPoeState(string port, bool enabled);
+    }
+
+    /// <summary>
+    /// Standardized interface for network switch devices that support per-port PoE control
+    /// and VLAN assignment.
+    /// </summary>
+    public interface INetworkSwitchPoeVlanManager : INetworkSwitchVlanManager, INetworkSwitchPoeManager
+    {
+
+    }
+}