功能：摄像头状态指示器 + 截图缓存优化 + 截图预热

1. 摄像头列表状态指示器（绿/红点）
   - 新增状态列显示摄像头截图可用性
   - 绿色=截图正常，红色=截图失败，灰色=加载中
   - 使用 /snap/image 代理端点检测状态

2. 截图缓存优化（getSnapUrl 重写）
   - 非强制模式：返回稳定URL（无时间戳），浏览器缓存5分钟
   - 强制模式：先触发边缘截图，再返回带时间戳URL破缓存
   - 使用 /snap/image 代理端点，避免COS预签名URL过期问题

3. 截图预热（新增摄像头时）
   - 添加摄像头成功后自动触发首次截图
   - 预热失败不影响主流程（非阻塞）

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

apps/web-antd/src/views/aiot/device/camera/index.vue

@@ -32,9 +32,11 @@ import {
   getCameraList,
   getMediaServerList,
   getRoiByCameraId,
+  getSnapUrl,
   pushAllConfig,
   saveCamera,
 } from '#/api/aiot/device';
+import { wvpRequestClient } from '#/api/aiot/request';
 
 defineOptions({ name: 'AiotDeviceCamera' });
 
@@ -45,12 +47,14 @@ const router = useRouter();
 const loading = ref(false);
 const cameraList = ref<AiotDeviceApi.Camera[]>([]);
 const roiCounts = ref<Record<string, number>>({});
+const cameraStatus = ref<Record<string, boolean | null>>({});
 const page = ref(1);
 const pageSize = ref(15);
 const total = ref(0);
 const searchQuery = ref('');
 
 const columns = [
+  { title: '状态', key: 'status', width: 60, align: 'center' as const },
   { title: '应用名', dataIndex: 'app', width: 120 },
   { title: '流ID', dataIndex: 'stream', width: 150 },
   { title: '拉流地址', dataIndex: 'srcUrl', ellipsis: true },
@@ -113,6 +117,7 @@ async function loadData() {
     cameraList.value = res.list || [];
     total.value = res.total || 0;
     loadRoiCounts();
+    loadCameraStatus();
   } catch {
     message.error('加载摄像头列表失败');
   } finally {
@@ -133,6 +138,24 @@ function loadRoiCounts() {
   }
 }
 
+function loadCameraStatus() {
+  for (const cam of cameraList.value) {
+    const cameraCode = cam.cameraCode;
+    if (!cameraCode) continue;
+    wvpRequestClient
+      .get('/aiot/device/roi/snap/image', {
+        params: { cameraCode },
+        responseType: 'blob',
+      })
+      .then(() => {
+        cameraStatus.value = { ...cameraStatus.value, [cameraCode]: true };
+      })
+      .catch(() => {
+        cameraStatus.value = { ...cameraStatus.value, [cameraCode]: false };
+      });
+  }
+}
+
 async function loadMediaServers() {
   try {
     const data = await getMediaServerList();
@@ -252,7 +275,19 @@ async function handleSave() {
     await saveCamera({ ...editForm });
     message.success(editForm.id ? '编辑成功' : '添加成功');
     editModalOpen.value = false;
-    loadData();
+    // 新增摄像头成功后自动触发首次截图预热（非阻塞）
+    if (!editForm.id) {
+      loadData().then(() => {
+        const saved = cameraList.value.find(
+          (c) => c.app === editForm.app && c.stream === editForm.stream,
+        );
+        if (saved?.cameraCode) {
+          getSnapUrl(saved.cameraCode, true).catch(() => {});
+        }
+      });
+    } else {
+      loadData();
+    }
   } catch (err: any) {
     message.error(err?.message || '保存失败');
   } finally {
@@ -382,7 +417,19 @@ onMounted(() => {
         size="middle"
       >
         <template #bodyCell="{ column, record }">
-          <template v-if="column.key === 'roiCount'">
+          <template v-if="column.key === 'status'">
+            <Badge
+              :status="
+                cameraStatus[record.cameraCode] === null ||
+                cameraStatus[record.cameraCode] === undefined
+                  ? 'default'
+                  : cameraStatus[record.cameraCode]
+                    ? 'success'
+                    : 'error'
+              "
+            />
+          </template>
+          <template v-else-if="column.key === 'roiCount'">
             <Badge
               :count="roiCounts[record.cameraCode] ?? 0"
               :number-style="{ backgroundColor: '#1677ff' }"