Add JSDoc documentation and file headers to all source files

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

src/types/vue.d.ts

@@ -1 +1,11 @@
+// The Lucia project.
+// Copyright 2024-2026 DSP, inc.  All rights reserved.
+// Authors:
+//   cindy.chang@dsp.im (Cindy Chang), 2024/7/9
+//   imacat.yang@dsp.im (imacat), 2026/3/6
+/**
+ * @module types/vue.d
+ *   Vue App type import (placeholder).
+ */
+
 import { App } from 'vue';