Add PackageInstaller for automatic Python server installation on first package load

UnityMcpBridge/Editor/Helpers/PackageInstaller.cs

@@ -0,0 +1,43 @@
+using UnityEditor;
+using UnityEngine;
+
+namespace UnityMcpBridge.Editor.Helpers
+{
+    /// <summary>
+    /// Handles automatic installation of the Python server when the package is first installed.
+    /// </summary>
+    [InitializeOnLoad]
+    public static class PackageInstaller
+    {
+        private const string InstallationFlagKey = "UnityMCP.ServerInstalled";
+        
+        static PackageInstaller()
+        {
+            // Check if this is the first time the package is loaded
+            if (!EditorPrefs.GetBool(InstallationFlagKey, false))
+            {
+                // Schedule the installation for after Unity is fully loaded
+                EditorApplication.delayCall += InstallServerOnFirstLoad;
+            }
+        }
+        
+        private static void InstallServerOnFirstLoad()
+        {
+            try
+            {
+                Debug.Log("Unity MCP: Installing Python server...");
+                ServerInstaller.EnsureServerInstalled();
+                
+                // Mark as installed
+                EditorPrefs.SetBool(InstallationFlagKey, true);
+                
+                Debug.Log("Unity MCP: Python server installation completed successfully.");
+            }
+            catch (System.Exception ex)
+            {
+                Debug.LogError($"Unity MCP: Failed to install Python server: {ex.Message}");
+                Debug.LogWarning("Unity MCP: You may need to manually install the Python server. Check the Unity MCP Editor Window for instructions.");
+            }
+        }
+    }
+}