feat(lmxproxy): phase 1 — v2 protocol types and domain model

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lmxproxy/src-reference/ZB.MOM.WW.LmxProxy.Client/LmxProxyClient.ApiKeyInfo.cs

@@ -0,0 +1,36 @@
+namespace ZB.MOM.WW.LmxProxy.Client
+{
+    /// <summary>
+    /// API key information returned from CheckApiKey
+    /// </summary>
+    public class ApiKeyInfo
+    {
+        /// <summary>
+        /// Whether the API key is valid
+        /// </summary>
+        public bool IsValid { get; }
+
+        /// <summary>
+        /// The role assigned to the API key
+        /// </summary>
+        public string Role { get; }
+
+        /// <summary>
+        /// Description of the API key
+        /// </summary>
+        public string Description { get; }
+
+        /// <summary>
+        /// Initializes a new instance of the ApiKeyInfo class
+        /// </summary>
+        /// <param name="isValid">Whether the API key is valid</param>
+        /// <param name="role">The role assigned to the API key</param>
+        /// <param name="description">Description of the API key</param>
+        public ApiKeyInfo(bool isValid, string role, string description)
+        {
+            IsValid = isValid;
+            Role = role ?? string.Empty;
+            Description = description ?? string.Empty;
+        }
+    }
+}