feat(license): 支持在租户平台修改 License 过期时间

描述详情框中的过期时间行增加内联日期选择器，与最大设备数保持
相同的行内编辑交互，支持设置具体日期或留空（永久有效）。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tenant-platform/src/api/license.ts

@@ -104,7 +104,7 @@ export const licenseApi = {
     )
   },
 
-  updateAppLicense(appKey: string, data: { maxDevices?: number; isActive?: boolean; remark?: string }) {
+  updateAppLicense(appKey: string, data: { maxDevices?: number; isActive?: boolean; remark?: string; expiresAt?: string }) {
     return licenseClient.patch<{ data: AppLicense }>(
       `/api/license/admin/apps/${encodeURIComponent(appKey)}`,
       data,

tenant-platform/src/views/license/LicenseManagementView.vue

@@ -64,7 +64,22 @@
             </el-descriptions-item>
             <el-descriptions-item label="已注册设备">{{ license?.registeredDevices ?? devices.length }}</el-descriptions-item>
             <el-descriptions-item label="过期时间">
-              {{ license?.expiresAt ? formatDate(license.expiresAt) : '永久' }}
+              <div v-if="!editingExpiresAt" class="max-devices-display">
+                <span>{{ license?.expiresAt ? formatDate(license.expiresAt) : '永久' }}</span>
+                <el-button link type="primary" size="small" style="margin-left:8px" @click="startEditExpiresAt">修改</el-button>
+              </div>
+              <div v-else class="max-devices-edit">
+                <el-date-picker
+                  v-model="editExpiresAtValue"
+                  type="datetime"
+                  placeholder="留空表示永久"
+                  clearable
+                  style="width:200px"
+                  size="small"
+                />
+                <el-button type="primary" size="small" :loading="savingExpiresAt" style="margin-left:8px" @click="saveExpiresAt">保存</el-button>
+                <el-button size="small" style="margin-left:4px" @click="editingExpiresAt = false">取消</el-button>
+              </div>
             </el-descriptions-item>
           </el-descriptions>
         </div>
@@ -163,6 +178,9 @@ const loading = ref(false)
 const editingMaxDevices = ref(false)
 const editMaxDevicesValue = ref(1)
 const savingMaxDevices = ref(false)
+const editingExpiresAt = ref(false)
+const editExpiresAtValue = ref<Date | null>(null)
+const savingExpiresAt = ref(false)
 
 const appName = computed(() => currentApp.value?.name || license.value?.name || appKey.value || '-')
 const activeDevices = computed(() => devices.value.filter(d => d.isActive).length)
@@ -213,6 +231,28 @@ async function saveMaxDevices() {
   }
 }
 
+function startEditExpiresAt() {
+  editExpiresAtValue.value = license.value?.expiresAt ? new Date(license.value.expiresAt) : null
+  editingExpiresAt.value = true
+}
+
+async function saveExpiresAt() {
+  const key = appKey.value
+  if (!key) return
+  savingExpiresAt.value = true
+  try {
+    const expiresAt = editExpiresAtValue.value ? editExpiresAtValue.value.toISOString() : ''
+    const res = await licenseApi.updateAppLicense(key, { expiresAt })
+    license.value = res.data.data
+    editingExpiresAt.value = false
+    ElMessage.success('过期时间已更新')
+  } catch {
+    ElMessage.error('更新失败')
+  } finally {
+    savingExpiresAt.value = false
+  }
+}
+
 async function revokeDevice(row: LicenseDevice) {
   try {
     await ElMessageBox.confirm('确认吊销该设备？', '吊销确认', { type: 'warning' })