Add accounts UI with list, create, edit, detail tabs for all sub-entities

Accounts list with paginated table, search, sort. Account detail page with
tabs for members, payment methods, tax exemptions, and processor links.
All sub-entities have create/edit dialogs and delete actions. Forms use
shared Zod schemas via react-hook-form.

packages/admin/src/api/members.ts

@@ -0,0 +1,27 @@
+import { queryOptions } from '@tanstack/react-query'
+import { api } from '@/lib/api-client'
+import type { Member } from '@/types/account'
+import type { PaginatedResponse, PaginationInput } from '@forte/shared/schemas'
+
+export const memberKeys = {
+  all: (accountId: string) => ['accounts', accountId, 'members'] as const,
+  list: (accountId: string, params: PaginationInput) => [...memberKeys.all(accountId), params] as const,
+}
+
+export function memberListOptions(accountId: string, params: PaginationInput) {
+  return queryOptions({
+    queryKey: memberKeys.list(accountId, params),
+    queryFn: () => api.get<PaginatedResponse<Member>>(`/v1/accounts/${accountId}/members`, params),
+  })
+}
+
+export const memberMutations = {
+  create: (accountId: string, data: Record<string, unknown>) =>
+    api.post<Member>(`/v1/accounts/${accountId}/members`, data),
+
+  update: (id: string, data: Record<string, unknown>) =>
+    api.patch<Member>(`/v1/members/${id}`, data),
+
+  delete: (id: string) =>
+    api.del<Member>(`/v1/members/${id}`),
+}