fix: levels and categories empty due to res vs res.data mismatch

- Fix Classification.vue: levels use res.data, auto-fetch on mount
- Fix Task.vue: levels and categories use res.data
- Fix Project.vue: templates use res.data

frontend/src/views/classification/Classification.vue

@@ -124,7 +124,7 @@ async function fetchMeta() {
   try {
     const [pRes, lRes] = await Promise.all([getProjects({ page: 1, page_size: 100 }), getDataLevels()])
     projects.value = (pRes as any)?.data || []
-    levels.value = (lRes as any) || []
+    levels.value = (lRes as any)?.data || []
   } catch (e) {
     // ignore
   }
@@ -132,6 +132,7 @@ async function fetchMeta() {
 
 onMounted(() => {
   fetchMeta()
+  fetchData()
 })
 </script>
 

frontend/src/views/project/Project.vue

@@ -215,7 +215,7 @@ async function handleDelete(p: ProjectItem) {
 async function fetchMeta() {
   try {
     const [tRes, sRes] = await Promise.all([getTemplates(), getDataSources()])
-    templates.value = (tRes as any) || []
+    templates.value = (tRes as any)?.data || []
     dataSources.value = (sRes as any)?.data || []
   } catch (e) {
     // ignore

frontend/src/views/task/Task.vue

@@ -159,8 +159,8 @@ async function fetchData() {
 async function fetchMeta() {
   try {
     const [catRes, levelRes] = await Promise.all([getCategoryTree(), getDataLevels()])
-    levels.value = (levelRes as any) || []
-    flatCategories.value = flattenCategories((catRes as any) || [])
+    levels.value = (levelRes as any)?.data || []
+    flatCategories.value = flattenCategories((catRes as any)?.data || [])
   } catch (e) {
     // ignore
   }