fix: 登录页内容补偿导航栏高度，视觉上更居中

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

charge-front/src/pages/login/login.vue

@@ -83,7 +83,7 @@ const performRedirect = (url: string) => {
   align-items: center;
   justify-content: center;
   background: var(--color-sec);
-  padding: 64rpx 56rpx;
+  padding: 0 56rpx 160rpx;
 }
 
 .center {