docs: include complete AGPL-3.0 license

Author: yulianQS

LICENSE

@@ -1,17 +1,294 @@
-QSflow is free software: you can redistribute it and/or modify it under the
-terms of the GNU Affero General Public License as published by the Free
-Software Foundation, either version 3 of the License, or (at your option) any
-later version.
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
 
-QSflow 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 Affero General Public License for more
-details.
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
 
-You should have received a copy of the GNU Affero General Public License along
-with QSflow. The complete license text is available at:
-https://www.gnu.org/licenses/agpl-3.0.html
+                            Preamble
 
-SPDX-License-Identifier: AGPL-3.0-or-later
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
 
-Copyright (C) 2026 K&C and QSflow contributors
+  The licenses for most software and other practical works are designed
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