fix: 清理前端异步请求生命周期

- 页面卸载和弹窗关闭时终止 SSE

- 为版本检查增加超时、中止与重复请求保护

easyflow-ui-usercenter/app/src/components/chat/sender.vue

@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import type { ChatTimeTimelineItem } from '@easyflow/types';
 
-import { inject, ref } from 'vue';
+import { inject, onBeforeUnmount, ref } from 'vue';
 
 import { ChatTimeTimelineBuilder, uuid } from '@easyflow/utils';
 
@@ -237,6 +237,12 @@ function normalizeSseRoundMeta(meta: any): SseRoundMeta {
     variantIndex,
   };
 }
+
+onBeforeUnmount(() => {
+  if (btnLoading.value) {
+    stopSse();
+  }
+});
 </script>
 
 <template>