refactor: replace company name with brand name in footer copyright

- Replace full company name with brand name 'Jingrow' in footer copyright
- Use appName variable for better consistency and maintainability
- Improves brand consistency across the homepage
- Follows industry best practices for footer copyright display

apps/jingrow/frontend/src/views/HomePage.vue

@@ -1184,7 +1184,7 @@ onUnmounted(() => {
                 </a>
               </div>
               <div class="footer-copyright">
-                <p class="copyright-text">© {{ currentYear }} {{ t('Guangzhou Sunflower Network Information Technology Co., Ltd.') }} {{ t('All Rights Reserved') }}</p>
+                <p class="copyright-text">© {{ currentYear }} {{ appName }} {{ t('All Rights Reserved') }}</p>
                 <p class="icp-text">
                   <a href="https://beian.miit.gov.cn" target="_blank" rel="noopener noreferrer">粤ICP备20016818号</a>
                 </p>