feat: 新增客户管理全模块功能

实现客户信息、客户部门、客户账号三个子模块的完整CRUD，包含：
1. 数据库实体、DTO、控制器、服务层代码
2. RBAC权限映射与菜单种子数据扩展
3. 前端路由与API封装
4. 数据权限隔离与鉴权逻辑
5. 配套工具脚本与测试验证清单

client/src/api/customer.ts

@@ -0,0 +1,92 @@
+import request from '@/utils/request';
+
+export interface CustomerInfo {
+	id: number;
+	customerNo: string;
+	customerName: string;
+	province?: string;
+	city?: string;
+	district?: string;
+	address?: string;
+	contactPerson?: string;
+	contactPhone?: string;
+	postalCode?: string;
+	fax?: string;
+	customerLevel?: string;
+	status: number;
+	salesmanId?: number;
+	createdAt: string;
+	updatedAt: string;
+}
+
+export interface CustomerQuery {
+	page?: number;
+	pageSize?: number;
+	keyword?: string;
+	status?: number;
+	salesmanId?: number;
+}
+
+export interface CustomerListResult {
+	list: CustomerInfo[];
+	total: number;
+	page: number;
+	pageSize: number;
+}
+
+export interface CustomerCreateParams {
+	customerName: string;
+	province?: string;
+	city?: string;
+	district?: string;
+	address?: string;
+	contactPerson?: string;
+	contactPhone?: string;
+	postalCode?: string;
+	fax?: string;
+	customerLevel?: string;
+	status?: number;
+	salesmanId?: number;
+}
+
+export interface CustomerUpdateParams {
+	customerName?: string;
+	province?: string;
+	city?: string;
+	district?: string;
+	address?: string;
+	contactPerson?: string;
+	contactPhone?: string;
+	postalCode?: string;
+	fax?: string;
+	customerLevel?: string;
+	status?: number;
+	salesmanId?: number;
+}
+
+export interface CustomerStatusParams {
+	status: number;
+}
+
+export const customerApi = {
+	getCustomerList: (params: CustomerQuery) =>
+		request.get<CustomerListResult>('/customers', { params }),
+
+	getCustomerDetail: (id: number) =>
+		request.get<CustomerInfo>(`/customers/${id}`),
+
+	getCustomerOptions: () =>
+		request.get<CustomerInfo[]>('/customers/options/all'),
+
+	createCustomer: (data: CustomerCreateParams) =>
+		request.post('/customers', data),
+
+	updateCustomer: (id: number, data: CustomerUpdateParams) =>
+		request.put(`/customers/${id}`, data),
+
+	deleteCustomer: (id: number) =>
+		request.delete(`/customers/${id}`),
+
+	updateCustomerStatus: (id: number, status: number) =>
+		request.put(`/customers/${id}/status`, { status }),
+};