新增ICP备案号提示，优化登录页面布局和样式

src/views/Login.vue

@@ -37,6 +37,10 @@
 
 
     </el-card>
+    
+    <div class="footer">
+      <p>桂ICP备2025067557号-2</p>
+    </div>
   </div>
 </template>
 
@@ -153,6 +157,7 @@ async function onSubmit() {
 .login-page {
   min-height: 100vh;
   display: flex;
+  flex-direction: column;
   align-items: center;
   justify-content: center;
   background: linear-gradient(135deg, #f2f6fc 0%, #ffffff 100%);
@@ -203,11 +208,22 @@ async function onSubmit() {
   font-size: 16px;
 }
 
+.footer {
+  margin-top: 20px;
+  text-align: center;
+  color: #909399;
+  font-size: 12px;
+}
+
+.footer p {
+  margin: 0;
+}
+
 /* 移动端优化 */
 @media (max-width: 768px) {
   .login-page {
     padding: 16px;
-    align-items: flex-start;
+    align-items: center;
     padding-top: 10vh;
   }