Change license to GPLv3 and add license headers to all files

pnpm-lock.yaml

@@ -1,3 +1,19 @@
+# This file is part of <project name>.
+#
+# Copyright (C) 2024 Oscloud
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
 lockfileVersion: "6.0"
 
 settings: