fix(frontend): 注册 ElementPlus 插件，修复 async 语法错误

- 统一在 createApp 后调用 app.use(ElementPlus)
- 为 handlePublish 添加 async 关键字
- 修正静态资源路径引用
- 解决登录页空白、按钮不可用问题

版本: v1.0.1

platform/frontend/index.html

@@ -162,7 +162,9 @@
                 }
             }
         };
-        Vue.createApp(App).mount('#app');
+        const app = Vue.createApp(App);
+            app.use(ElementPlus);
+            app.mount('#app');
     </script>
 </body>
 </html>

platform/frontend/logs.html

@@ -107,7 +107,9 @@
                     .catch(() => { localStorage.removeItem('authToken'); window.location.href = '/'; });
             }
         };
-        Vue.createApp(LogsApp).mount('#app');
+                const app = Vue.createApp(LogsApp);
+            app.use(ElementPlus);
+            app.mount('#app');
     </script>
 </body>
 </html>

platform/frontend/topics.html

@@ -164,7 +164,7 @@
                         await this.fetchTopics();
                     } else { this.$message.info('仅待审查选题可优化'); }
                 },
-                handlePublish(topic) { this.$message.success('发布：' + topic.title); await this.fetchTopics(); },
+                async handlePublish(topic) { this.$message.success('发布：' + topic.title); await this.fetchTopics(); },
                 deleteTopic(id) {
                     this.$confirm('确定删除？', '提示', { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' })
                         .then(async () => { this.$message.success('删除成功'); await this.fetchTopics(); }).catch(() => {});
@@ -182,7 +182,9 @@
                     .catch(() => { localStorage.removeItem('authToken'); window.location.href = '/'; });
             }
         };
-        Vue.createApp(TopicsApp).mount('#app');
+                const app = Vue.createApp(TopicsApp);
+            app.use(ElementPlus);
+            app.mount('#app');
     </script>
 </body>
 </html>

platform/frontend/users.html

@@ -127,7 +127,9 @@
                     .catch(() => { localStorage.removeItem('authToken'); window.location.href = '/'; });
             }
         };
-        Vue.createApp(UsersApp).mount('#app');
+                const app = Vue.createApp(UsersApp);
+            app.use(ElementPlus);
+            app.mount('#app');
     </script>
 </body>
 </html>