fix(前端): 兼容非安全上下文的任务请求键生成

crypto.randomUUID 仅在 HTTPS 或 localhost 下存在，客户内网
以 http://<内网IP> 访问时该 API 为 undefined，而新建任务
对话框在页面挂载即调用，会直接 TypeError 导致整页白屏。

新增 newRequestKey 工具：优先 randomUUID，不可用时降级为
getRandomValues 拼 v4 格式（非安全上下文仍可用）。

Co-Authored-By: Claude Code <noreply@anthropic.com>

frontend/src/views/system/tplus/CreateTaskDialog.vue

@@ -3,6 +3,7 @@ import { ref, watch } from 'vue'
 import { ElMessage } from 'element-plus'
 import * as api from '@/api/tplus'
 import { handledError } from '@/utils/error'
+import { newRequestKey } from '@/utils/uuid'
 import { entities } from './labels'
 
 const visible = defineModel<boolean>({ required: true })
@@ -11,9 +12,9 @@ const emit = defineEmits<{ created: [batch: api.TPlusDetail] }>()
 const taskType = ref<api.TaskType>('READ')
 const selected = ref<api.EntityType[]>(['personnel'])
 const pending = ref(false)
-let requestKey = crypto.randomUUID()
+let requestKey = newRequestKey()
 // 请求失败后保留键，只有意图改变或成功后才换键。
-watch([taskType, selected], () => { requestKey = crypto.randomUUID() }, { deep: true, flush: 'sync' })
+watch([taskType, selected], () => { requestKey = newRequestKey() }, { deep: true, flush: 'sync' })
 
 async function submit(): Promise<void> {
   if (pending.value || !props.configured) return
@@ -21,7 +22,7 @@ async function submit(): Promise<void> {
   try {
     const batch = await api.createTask({ task_type: taskType.value,
       entity_types: taskType.value === 'AUDIT' ? [] : [...selected.value], request_key: requestKey })
-    requestKey = crypto.randomUUID()
+    requestKey = newRequestKey()
     visible.value = false
     ElMessage.success('任务已排队，处理完成后可刷新查看')
     emit('created', batch)