feat(customer): admin CRUD endpoints (#6232)

**What**

- GET /customers/:id
- POST /customers/:id
- DELETE /customers/:id
- POST /customers

Including workflows for each.

packages/types/src/customer/mutations.ts

@@ -48,12 +48,21 @@ export interface CreateCustomerDTO {
 
 export interface UpdateCustomerDTO {
   id: string
-  company_name?: string
-  first_name?: string
-  last_name?: string
-  email?: string
-  phone?: string
-  metadata?: Record<string, unknown>
+  company_name?: string | null
+  first_name?: string | null
+  last_name?: string | null
+  email?: string | null
+  phone?: string | null
+  metadata?: Record<string, unknown> | null
+}
+
+export interface CustomerUpdatableFields {
+  company_name?: string | null
+  first_name?: string | null
+  last_name?: string | null
+  email?: string | null
+  phone?: string | null
+  metadata?: Record<string, unknown> | null
 }
 
 export interface CreateCustomerGroupDTO {

packages/types/src/customer/service.ts

@@ -17,6 +17,7 @@ import {
   CreateCustomerAddressDTO,
   CreateCustomerDTO,
   CreateCustomerGroupDTO,
+  CustomerUpdatableFields,
   UpdateCustomerAddressDTO,
 } from "./mutations"
 
@@ -35,17 +36,17 @@ export interface ICustomerModuleService extends IModuleService {
 
   update(
     customerId: string,
-    data: Partial<CreateCustomerDTO>,
+    data: CustomerUpdatableFields,
     sharedContext?: Context
   ): Promise<CustomerDTO>
   update(
     customerIds: string[],
-    data: Partial<CreateCustomerDTO>,
+    data: CustomerUpdatableFields,
     sharedContext?: Context
   ): Promise<CustomerDTO[]>
   update(
     selector: FilterableCustomerProps,
-    data: Partial<CreateCustomerDTO>,
+    data: CustomerUpdatableFields,
     sharedContext?: Context
   ): Promise<CustomerDTO[]>