Add license headers, add @mediabunny/server to build process, add doc blocks, small fixes

packages/server/src/video-encoder.ts

@@ -1,6 +1,14 @@
+/*!
+ * Copyright (c) 2026-present, Vanilagy and contributors
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
 import {
 	CustomVideoEncoder,
-	MaybePromise,
+	type MaybePromise,
 	QUALITY_MEDIUM,
 	VideoCodec,
 	VideoSample,