fix: restore standard MIT license text for GitHub license detection

The explanatory prose between the title and the permission notice kept
licensee from matching the MIT template, so the marketplace review bot
reported the repository as having no recognized license. The Claudian
derivation note moves to NOTICE and the upstream copyright line is kept
verbatim in LICENSE.

Author: luoxuanzao

LICENSE

@@ -1,14 +1,7 @@
 MIT License
 
-Portions of this software are derived from Claudian
-(https://github.com/YishenTu/claudian), authored by Yishen Tu. Claudian's
-upstream MIT copyright notice is retained verbatim:
-
-    Copyright (c) 2025
-
-Copyright for Qoderian's own changes and additions:
-
-    Copyright (c) 2026 Qoder
+Copyright (c) 2026 Qoder
+Copyright (c) 2025
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

NOTICE

@@ -5,7 +5,8 @@ This project contains code derived from Claudian:
 https://github.com/YishenTu/claudian
 
 Claudian is distributed under the MIT License. Its original copyright notice
-and MIT permission notice are retained in this repository's LICENSE file.
+("Copyright (c) 2025") is retained verbatim in this repository's LICENSE file
+alongside Qoder's own notice, and the MIT permission notice applies to both.
 Qoder thanks the Claudian authors and contributors for their work.
 
 Qoderian also includes or bundles third-party dependencies. Those components