Add JSDoc documentation and file headers to all source files

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

src/stores/acctMgmt.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/acctMgmt Account management store for CRUD
+ *   operations on user accounts (admin functionality).
+ */
+
 import { defineStore } from 'pinia';
 import apiClient from '@/api/client.js';
 import apiError from '@/module/apiError';