fix(schema): change sessionSigs type from never to undefined in auth context schema

Author: Ansonhkg

packages/networks/src/networks/vNaga/shared/managers/api-manager/executeJs/executeJs.InputSchema.ts

@@ -60,7 +60,7 @@ const ExecuteJsInputWithAuthContextSchema = ExecuteJsSharedFieldsSchema.extend({
   /**
    * Session signatures must not be supplied when an auth context is provided.
    */
-  sessionSigs: z.never().optional(),
+  sessionSigs: z.undefined().optional(),
 });
 
 const ExecuteJsInputWithSessionSigsSchema = ExecuteJsSharedFieldsSchema.extend({