style: 增加资源关卡最大显示数到5，在1080P下达到最佳效果，并修改响应式布局

frontend/src/views/Home.vue

@@ -530,7 +530,7 @@ onMounted(() => {
 
 .resource-list {
   display: grid;
-  grid-template-columns: repeat(4, 1fr);
+  grid-template-columns: repeat(5, 1fr);
   gap: 16px;
 }
 
@@ -723,6 +723,13 @@ onMounted(() => {
   padding: 40px 0;
 }
 
+@media (max-width: 1500px) {
+  .activity-list,
+  .resource-list {
+    grid-template-columns: repeat(4, 1fr);
+  }
+}
+
 @media (max-width: 1200px) {
   .activity-list,
   .resource-list {
@@ -730,13 +737,6 @@ onMounted(() => {
   }
 }
 
-@media (max-width: 900px) {
-  .activity-list,
-  .resource-list {
-    grid-template-columns: repeat(2, 1fr);
-  }
-}
-
 /* 代理状态样式 */
 .proxy-card {
   margin-bottom: 24px;