fix(aiot): ROI配置页面显示应用名而不是camera_code

问题：ROI配置页面显示camera_code（技术标识符），用户体验差
修复：
- 摄像头选择器显示应用名
- 页面标题显示应用名（如：测试区域A - ROI配置）
- camera_code仅作为后台标识符使用，不暴露给用户

影响页面：/aiot/device/roi

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

@@ -47,6 +47,7 @@ const router = useRouter();
 // ==================== 摄像头选择 ====================
 
 const cameraCode = ref('');
+const currentCamera = ref<AiotDeviceApi.Camera | null>(null);
 
 const showCameraSelector = ref(false);
 const cameraOptions = ref<
@@ -74,6 +75,8 @@ onMounted(async () => {
   const q = route.query;
   if (q.cameraCode) {
     cameraCode.value = String(q.cameraCode);
+    // 加载摄像头信息以获取应用名
+    await loadCurrentCamera();
     await buildSnapUrl();
     loadRois();
   } else {
@@ -84,6 +87,19 @@ onMounted(async () => {
 
 // ==================== 摄像头加载与选择 ====================
 
+async function loadCurrentCamera() {
+  try {
+    const res = await getCameraList({ page: 1, count: 200 });
+    const list = res.list || [];
+    const camera = list.find((c: AiotDeviceApi.Camera) => c.cameraCode === cameraCode.value);
+    if (camera) {
+      currentCamera.value = camera;
+    }
+  } catch {
+    console.error('加载摄像头信息失败');
+  }
+}
+
 async function loadCameraOptions() {
   cameraLoading.value = true;
   try {
@@ -91,7 +107,7 @@ async function loadCameraOptions() {
     const list = res.list || [];
     cameraOptions.value = list.map((cam: AiotDeviceApi.Camera) => ({
       value: cam.cameraCode || '',
-      label: `${cam.cameraCode || cam.stream}${cam.srcUrl ? ` (${cam.srcUrl})` : ''}`,
+      label: `${cam.app || cam.stream}${cam.srcUrl ? ` (${cam.srcUrl})` : ''}`,
       camera: cam,
     }));
   } catch {
@@ -105,6 +121,7 @@ async function onCameraSelected(val: string) {
   const opt = cameraOptions.value.find((o) => o.value === val);
   if (opt) {
     cameraCode.value = val;
+    currentCamera.value = opt.camera;
     showCameraSelector.value = false;
     await buildSnapUrl();
     loadRois();
@@ -280,7 +297,7 @@ function handlePush() {
       <div class="page-header">
         <div class="header-left">
           <Button size="small" @click="goBack">返回</Button>
-          <h3>{{ cameraCode }} - ROI配置</h3>
+          <h3>{{ currentCamera?.app || cameraCode }} - ROI配置</h3>
         </div>
         <div class="header-right">
           <Button