Add JSDoc documentation and file headers to all source files

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

tests/components/Search.test.js

@@ -1,3 +1,8 @@
+// The Lucia project.
+// Copyright 2026-2026 DSP, inc.  All rights reserved.
+// Authors:
+//   imacat.yang@dsp.im (imacat), 2026/03/05
+
 import { describe, it, expect } from 'vitest';
 import { mount } from '@vue/test-utils';
 import Search from '@/components/Search.vue';