chore: 著作権とライセンスについての情報を各ファイルに追加する (#11348)

* chore: Add the SPDX information to each file

Add copyright and licensing information as defined in version 3.0 of
the REUSE Specification.

* tweak format

---------

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>

packages/frontend/src/workers/test-webgl2.ts

@@ -1,7 +1,12 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and other misskey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 const canvas = globalThis.OffscreenCanvas && new OffscreenCanvas(1, 1);
-const gl = canvas?.getContext('webgl2');
+const gl = canvas.getContext('webgl2');
 if (gl) {
-    postMessage({ result: true });
+	postMessage({ result: true });
 } else {
-    postMessage({ result: false });
+	postMessage({ result: false });
 }