Add JSDoc documentation and file headers to all source files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cypress/support/e2e.js

@@ -1,3 +1,8 @@
+// The Lucia project.
+// Copyright 2023-2026 DSP, inc.  All rights reserved.
+// Authors:
+//   chiayin.kuo@dsp.im (chiayin), 2023/01/31
+
 // ***********************************************************
 // This example support/index.js is processed and
 // loaded automatically before your test files.