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

Client/Packages/io.github.hatayama.uloopmcp/Runtime/SimulateKeyboard/KeyboardAction.cs

@@ -0,0 +1,9 @@
+namespace io.github.hatayama.uLoopMCP
+{
+    public enum KeyboardAction
+    {
+        Press = 0,
+        KeyDown = 1,
+        KeyUp = 2
+    }
+}