fix(photography):修复加载对话框关闭逻辑

- 更正 detail.vue 中请求状态重置逻辑
- 调整 LoadingDialog.vue 中关闭按钮显示条件
- 确保加载对话框在请求期间不可手动关闭

frontend/src/views/Photography/components/LoadingDialog.vue

@@ -1,7 +1,7 @@
 <template>
   <el-dialog
     v-model="visible"
-    :show-close="requesting"
+    :show-close="!requesting"
     :close-on-click-modal="false"
     :close-on-press-escape="false"
     width="1000px"

frontend/src/views/Photography/detail.vue

@@ -1252,7 +1252,7 @@ const generate = async function () {
       requesting.value = false  // 重置请求状态，允许再次生成
 
     }
-    requesting.value = true
+    requesting.value = false
   });
 }
 const openLoadingDialog = (timer: number) => {