Add JSDoc documentation and file headers to all source files

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

src/App.vue

@@ -3,5 +3,14 @@
 </template>
 
 <script setup lang="ts">
+// The Lucia project.
+// Copyright 2023-2026 DSP, inc.  All rights reserved.
+// Authors:
+//   chiayin.kuo@dsp.im (chiayin), 2023/1/31
+//   cindy.chang@dsp.im (Cindy Chang), 2024/5/30
+/**
+ * @module App Root application component that renders the router view.
+ */
+
 import { RouterView } from "vue-router";
 </script>