Add JSDoc documentation and file headers to all source files

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

src/stores/files.ts

@@ -1,3 +1,14 @@
+// The Lucia project.
+// Copyright 2023-2026 DSP, inc.  All rights reserved.
+// Authors:
+//   chiayin.kuo@dsp.im (chiayin), 2023/1/31
+//   imacat.yang@dsp.im (imacat), 2023/9/23
+//   cindy.chang@dsp.im (Cindy Chang), 2024/5/30
+/**
+ * @module stores/files File management store for listing, uploading,
+ *   renaming, downloading, and deleting log/filter/rule files.
+ */
+
 import { defineStore } from "pinia";
 import apiClient from "@/api/client.js";
 import moment from 'moment';
@@ -6,6 +17,7 @@ import Swal from 'sweetalert2';
 import { uploadFailedFirst, uploadFailedSecond, uploadloader, uploadSuccess, deleteSuccess } from '@/module/alertModal.js';
 import { useLoadingStore } from '@/stores/loading';
 
+/** Pinia store for file CRUD operations and upload workflow. */
 export const useFilesStore = defineStore('filesStore', {
   state: () => ({
     allEventFiles: [