chore(unity): 固定Unity CLI Loop本地包并移除UnitySkills依赖

Client/Packages/io.github.hatayama.uloopmcp/Editor/Api/McpTools/Ping/PingResponse.cs

@@ -0,0 +1,31 @@
+namespace io.github.hatayama.uLoopMCP
+{
+    /// <summary>
+    /// Response schema for Ping command
+    /// Provides type-safe response structure
+    /// </summary>
+    public class PingResponse : BaseToolResponse
+    {
+        /// <summary>
+        /// The response message from Unity
+        /// </summary>
+        public string Message { get; set; }
+
+        /// <summary>
+        /// Create a new PingResponse
+        /// </summary>
+        /// <param name="message">Response message</param>
+        public PingResponse(string message)
+        {
+            Message = message;
+        }
+
+        /// <summary>
+        /// Parameterless constructor for JSON deserialization
+        /// </summary>
+        public PingResponse()
+        {
+            Message = string.Empty;
+        }
+    }
+}