feat(dept): 实现部门管理前端页面

dept.ts API: CRUD + buildTree 树形构建；
DeptManagement 页面: 树形表格 + 新增/编辑/删除 + 权限守卫；
修复 validation-rules.ts 的 as const 导致 readonly 类型不兼容问题。

novalon-manage-web/src/api/dept.ts

@@ -0,0 +1,75 @@
+import request from '@/utils/request'
+
+export interface DeptItem {
+  id: number
+  parentId: number
+  deptName: string
+  orderNum: number
+  leader: string
+  phone: string
+  email: string
+  status: number
+  createdAt: string
+  updatedAt: string
+  children?: DeptItem[]
+}
+
+export interface CreateDeptRequest {
+  parentId?: number
+  deptName: string
+  orderNum?: number
+  leader?: string
+  phone?: string
+  email?: string
+  status?: number
+}
+
+export interface UpdateDeptRequest {
+  parentId?: number
+  deptName?: string
+  orderNum?: number
+  leader?: string
+  phone?: string
+  email?: string
+  status?: number
+}
+
+function buildTree(list: DeptItem[]): DeptItem[] {
+  const map = new Map<number, DeptItem>()
+  const roots: DeptItem[] = []
+  for (const item of list) {
+    map.set(item.id, { ...item, children: [] })
+  }
+  for (const item of list) {
+    const node = map.get(item.id)!
+    if (item.parentId === 0 || !map.has(item.parentId)) {
+      roots.push(node)
+    } else {
+      const parent = map.get(item.parentId)
+      parent?.children?.push(node)
+    }
+  }
+  return roots
+}
+
+export const deptApi = {
+  getAll: async (): Promise<DeptItem[]> => {
+    const res = await request.get<DeptItem[]>('/depts')
+    const list = Array.isArray(res) ? res : []
+    return buildTree(list)
+  },
+
+  getById: async (id: number): Promise<DeptItem> => {
+    const res = await request.get<DeptItem>(`/depts/${id}`)
+    return res as unknown as DeptItem
+  },
+
+  create: (data: CreateDeptRequest) =>
+    request.post<DeptItem>('/depts', data),
+
+  update: (id: number, data: UpdateDeptRequest) =>
+    request.put<DeptItem>(`/depts/${id}`, data),
+
+  delete: (id: number) =>
+    request.delete<void>(`/depts/${id}`),
+}