fix: 公安备案图标与文字居中对齐

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

components/layout/Footer.vue

@@ -17,7 +17,10 @@ const psBeian = config.public.psBeian
       <template v-if="psBeian">
         &nbsp;·&nbsp;
         <a :href="`https://beian.mps.gov.cn/#/query/webSearch?code=${psBeian}`" rel="noreferrer" target="_blank" class="hover:opacity-70 whitespace-nowrap" style="border-bottom: 1px solid var(--color-text-secondary); padding-bottom: 1px;">
-          <img src="@/assets/备案图标.png" alt="" class="w-3 h-3 inline" />川公网安备{{ psBeian }}号
+          <span class="inline-flex items-center gap-0.5">
+            <img src="@/assets/备案图标.png" alt="" class="w-3 h-3" />
+            <span>川公网安备{{ psBeian }}号</span>
+          </span>
         </a>
       </template>
     </p>