feat: 分片上传断点续传、临时目录后台配置与清扫、宇恒云账号管理

- 管理端大文件分片上传与 sessionStorage 续传；Nginx 大请求体/超时
- .chunk-uploads 定期清扫；system_config 后台配置保留时长与扫描间隔
- 宇恒云 POST /register 对接与 yuheng_cloud_register_records 留痕；yuheng_cloud:manage 权限

Made-with: Cursor

admin/src/views/settings/ChunkUploadCleanup.vue

@@ -0,0 +1,91 @@
+<template>
+  <div class="chunk-upload-cleanup">
+    <el-card>
+      <template #header>
+        <span>分片上传临时目录清理</span>
+      </template>
+      <p class="hint">
+        大文件分片上传时，未完成合并的会话保存在上传目录下的 <code>.chunk-uploads</code>。超过下方「保留时长」的目录会被定期删除。未在后台保存时，可使用环境变量
+        <code>YH_CHUNK_UPLOAD_MAX_AGE_HOURS</code>、<code>YH_CHUNK_UPLOAD_SWEEP_MINUTES</code>（保存后台配置后优先生效）。
+      </p>
+      <el-form v-if="canEdit" :model="form" label-width="140px" style="max-width: 520px">
+        <el-form-item label="保留时长（小时）">
+          <el-input-number v-model="form.max_age_hours" :min="6" :max="336" :step="6" controls-position="right" />
+          <span class="form-tip">6～336，默认 72；超过此时长未合并的会话视为非活动</span>
+        </el-form-item>
+        <el-form-item label="扫描间隔（分钟）">
+          <el-input-number v-model="form.sweep_minutes" :min="5" :max="1440" :step="5" controls-position="right" />
+          <span class="form-tip">5～1440，默认 60；服务端按此频率检查是否需清扫</span>
+        </el-form-item>
+        <el-form-item>
+          <el-button type="primary" :loading="loading" @click="handleSave">保存</el-button>
+        </el-form-item>
+      </el-form>
+      <el-alert v-else type="warning" title="无权限" description="需要「站点管理」权限。" :closable="false" />
+    </el-card>
+  </div>
+</template>
+
+<script setup>
+import { ref, reactive, onMounted, computed } from 'vue'
+import { ElMessage } from 'element-plus'
+import { getChunkUploadCleanup, updateChunkUploadCleanup } from '../../api/admin'
+import { useAuthStore } from '../../stores/auth'
+
+const authStore = useAuthStore()
+const loading = ref(false)
+const form = reactive({
+  max_age_hours: 72,
+  sweep_minutes: 60
+})
+
+const canEdit = computed(() => authStore.hasPermission('site:manage'))
+
+const fetchConfig = async () => {
+  if (!canEdit.value) return
+  try {
+    const res = await getChunkUploadCleanup()
+    form.max_age_hours = Number(res.max_age_hours) || 72
+    form.sweep_minutes = Number(res.sweep_minutes) || 60
+  } catch (e) {
+    ElMessage.error(e.message || '获取配置失败')
+  }
+}
+
+const handleSave = async () => {
+  loading.value = true
+  try {
+    await updateChunkUploadCleanup({
+      max_age_hours: form.max_age_hours,
+      sweep_minutes: form.sweep_minutes
+    })
+    ElMessage.success('保存成功，新参数在下次清扫周期生效')
+  } catch (e) {
+    ElMessage.error(e.response?.data?.error || e.message || '保存失败')
+  } finally {
+    loading.value = false
+  }
+}
+
+onMounted(fetchConfig)
+</script>
+
+<style scoped>
+.chunk-upload-cleanup {
+  padding: 0;
+}
+.hint {
+  margin: 0 0 20px;
+  font-size: 13px;
+  color: #606266;
+  line-height: 1.65;
+  max-width: 720px;
+}
+.form-tip {
+  display: block;
+  margin-top: 6px;
+  font-size: 12px;
+  color: #909399;
+  line-height: 1.4;
+}
+</style>