fix: 部门列表空/职务无法启用 — fetchTree适配树形API响应, positions表加status/code/description字段

frontend/src/views/system/departments/index.vue

@@ -74,9 +74,15 @@ async function fetchTree() {
   loading.value = true
   try {
     const res = await departmentApi.getList({ per_page: 500 })
-    const flat = res.data?.list || res.data?.data || []
-    flatDepts.value = flat.map(d => ({ id: d.id, name: d.name }))
-    treeData.value = buildTree(flat)
+    // Backend already returns a tree array directly in res.data
+    if (Array.isArray(res.data)) {
+      treeData.value = res.data
+      flatDepts.value = flattenTree(res.data)
+    } else {
+      const flat = res.data?.list || res.data?.data || []
+      flatDepts.value = flat.map(d => ({ id: d.id, name: d.name }))
+      treeData.value = buildTree(flat)
+    }
   } catch {
     //
   } finally {
@@ -84,9 +90,9 @@ async function fetchTree() {
   }
 }
 
-function buildTree(nodes, parentId = null) {
+function buildTree(nodes, parentId = 0) {
   return nodes
-    .filter(n => (n.parent_id ?? null) === parentId)
+    .filter(n => (n.parent_id ?? 0) === parentId)
     .map(n => ({ ...n, children: buildTree(nodes, n.id) }))
 }