fix:优化搜索逻辑

frontend/src/views/mobile/Home.vue

@@ -81,10 +81,16 @@ watch(
       searchForm.value.keyword = keyword;
       handleSearch();
     } else {
-      searchForm.value.keyword = "";
+      searchForm.value.keyword = resourceStore.keyword;
     }
   }
 );
+watch(
+  () => resourceStore.keyword,
+  (newKeyword) => {
+    searchForm.value.keyword = newKeyword;
+  }
+);
 
 // 方法定义
 const handleSearch = async () => {