FIx bug animation not stop. add more QOL for test animation scene. add AnimationSceneSkillTest.md to show how to use

Assets/PerfectWorld/Scripts/Addressable/AddressableManager.cs

@@ -493,25 +493,27 @@ namespace BrewMonster.Scripts
         /// <returns>True if the key exists, false otherwise.</returns>
         public static bool KeyExists(object key, System.Type type = null)
         {
+            string keyStr = key?.ToString();
+            if (string.IsNullOrEmpty(keyStr))
+                return false;
+
             #if UNITY_EDITOR
-            return !Instance._invalidAssetPaths.Contains(key.ToString());
-            #else
-            // Iterate through all loaded locators (catalogs)
+            // Failed loads are cached; still verify against catalog (do not assume unknown keys exist).
+            if (Instance != null && Instance._invalidAssetPaths.Contains(keyStr))
+                return false;
+            #endif
+
             foreach (IResourceLocator locator in Addressables.ResourceLocators)
             {
-                // If the locator finds the key, it returns true
-                if (locator.Locate(key, type, out var locations))
+                if (locator.Locate(key, type, out var locations)
+                    && locations != null
+                    && locations.Count > 0)
                 {
-                    // Double check that it actually yielded at least one location
-                    if (locations != null && locations.Count > 0)
-                    {
-                        return true;
-                    }
+                    return true;
                 }
             }
 
             return false;
-            #endif
         }
 #endregion