feat: rebuild admin account management and ticket assignment

src/lib/customerAdminApi.js

@@ -24,9 +24,17 @@ export async function createCustomerWithPortalAccess(payload) {
   return adminFetch('/api/admin/customers', { method: 'POST', body: payload })
 }
 
+export async function listCustomersForAdmin() {
+  return adminFetch('/api/admin/customers', { method: 'GET' })
+}
+
 export async function updateCustomerWithPortalAccess(customerId, payload) {
   return adminFetch(`/api/admin/customers/${customerId}`, {
     method: 'PATCH',
     body: payload,
   })
 }
+
+export async function deleteCustomerWithPortalAccess(customerId) {
+  return adminFetch(`/api/admin/customers/${customerId}`, { method: 'DELETE' })
+}