chore: 整理 third-party Dark Reader 目录并移除本地说明文件跟踪

third-party/darkreader/tasks/check-exists.js

@@ -0,0 +1,12 @@
+// @ts-check
+import {existsSync} from 'node:fs';
+import {fileURLToPath} from 'node:url';
+
+const __filename = fileURLToPath(import.meta.url);
+
+const lastArg = process.argv.pop();
+if (lastArg === __filename) {
+    throw new Error('Error: File or directory expected as a single argument');
+}
+
+process.exit(existsSync(lastArg || '') ? 0 : 1);