新增客户标签库：管理员维护、员工选择

租户级标签 CRUD 与颜色预设；客户打标仅能从库中选择，设置页提供管理入口，列表筛选随标签库动态生成。

web/src/services/api.ts

@@ -292,6 +292,23 @@ export const createCustomer = (data: Partial<Customer>) => post<Customer>('/cust
 export const updateCustomer = (id: number, data: Partial<Customer>) => put<Customer>(`/customers/${id}`, data)
 export const deleteCustomer = (id: number) => del(`/customers/${id}`)
 
+// 客户标签库（管理员维护，全员可选）
+export interface CustomerTag {
+  id: number
+  tenant_id: number
+  name: string
+  color: string
+  sort_order: number
+  created_at?: string
+  updated_at?: string
+}
+export const getCustomerTags = () => get<CustomerTag[]>('/customer-tags')
+export const createCustomerTag = (data: { name: string; color?: string; sort_order?: number }) =>
+  post<CustomerTag>('/customer-tags', data)
+export const updateCustomerTag = (id: number, data: { name: string; color?: string; sort_order?: number }) =>
+  put<CustomerTag>(`/customer-tags/${id}`, data)
+export const deleteCustomerTag = (id: number) => del(`/customer-tags/${id}`)
+
 // Knowledge
 export const getKnowledgeCategories = () =>
   get<{ list: KnowledgeCategory[]; total_entries: number }>('/knowledge/categories')