added isLocal method to GuidInterface to check whether the given guid local or not.

src/Backends/Common/GuidInterface.php

@@ -43,4 +43,13 @@ interface GuidInterface
      * @return bool
      */
     public function has(array $guids, array $context = []): bool;
+
+    /**
+     * Is the given identifier a local id?
+     *
+     * @param string $guid
+     *
+     * @return bool
+     */
+    public function isLocal(string $guid): bool;
 }

src/Backends/Jellyfin/JellyfinGuid.php

@@ -55,6 +55,11 @@ class JellyfinGuid implements iGuid
         return count($this->ListExternalIds(guids: $guids, context: $context, log: false)) >= 1;
     }
 
+    public function isLocal(string $guid): bool
+    {
+        return false;
+    }
+
     /**
      * Get All Supported external ids.
      *