Task #76: Show roles management inside the Groups editor

Adds a "Roles" tab to the GroupDetailEditor in the admin Groups screen so
admins can manage which roles are auto-granted to members of a group.

Changes:
- OpenAPI: added `GET /roles` (operationId `listRoles`) and a `Role` schema
  in `lib/api-spec/openapi.yaml`. Ran `pnpm --filter @workspace/api-spec
  run codegen` to regenerate `lib/api-client-react` and `lib/api-zod`.
- API server: added `GET /api/roles` (admin-only) in
  `artifacts/api-server/src/routes/groups.ts`, returning all roles
  ordered by name.
- Frontend (`artifacts/teaboy-os/src/pages/admin.tsx`):
  - Imported `useListRoles` / `getListRolesQueryKey`.
  - Added `roleIds` state and a fourth `"roles"` tab to GroupDetailEditor
    with a checkbox list backed by the new endpoint, hydrated from
    `group.roleIds`.
  - Save now sends `roleIds: Array.from(roleIds)` via the existing
    `PATCH /api/groups/:id` mutation.
  - On save, also invalidate `getGetGroupQueryKey(editingGroupId)` so the
    detail cache (30s staleTime) reflects the new role list immediately
    when the editor is reopened.
- Translations: added `admin.groups.tab.roles`, `admin.groups.rolesHint`,
  and `admin.groups.rolesEmpty` in both `en.json` and `ar.json`.

Verification:
- `pnpm -w run typecheck` passes.
- `pnpm --filter @workspace/api-server test` — 42/42 pass.
- e2e (testing skill): logged in as admin, opened TeaBoy group, toggled
  the `user` role on the new Roles tab, saved, reopened — toggle
  persisted.

No deviations from the task description.

Replit-Task-Id: 42808400-9209-469b-b526-37c776ffb25d

lib/api-client-react/src/generated/api.schemas.ts

@@ -169,6 +169,16 @@ export interface AddUserRoleBody {
   roleName: string;
 }
 
+export interface Role {
+  id: number;
+  name: string;
+  /** @nullable */
+  descriptionAr?: string | null;
+  /** @nullable */
+  descriptionEn?: string | null;
+  createdAt: string;
+}
+
 export interface Group {
   id: number;
   name: string;

lib/api-client-react/src/generated/api.ts

@@ -53,6 +53,7 @@ import type {
   RequestUploadUrlBody,
   RequestUploadUrlResponse,
   ResetPasswordBody,
+  Role,
   SendMessageBody,
   Service,
   ServiceCategory,
@@ -4673,6 +4674,71 @@ export const useRemoveUserRole = <
   return useMutation(getRemoveUserRoleMutationOptions(options));
 };
 
+/**
+ * @summary List roles (admin)
+ */
+export const getListRolesUrl = () => {
+  return `/api/roles`;
+};
+
+export const listRoles = async (options?: RequestInit): Promise<Role[]> => {
+  return customFetch<Role[]>(getListRolesUrl(), {
+    ...options,
+    method: "GET",
+  });
+};
+
+export const getListRolesQueryKey = () => {
+  return [`/api/roles`] as const;
+};
+
+export const getListRolesQueryOptions = <
+  TData = Awaited<ReturnType<typeof listRoles>>,
+  TError = ErrorType<unknown>,
+>(options?: {
+  query?: UseQueryOptions<Awaited<ReturnType<typeof listRoles>>, TError, TData>;
+  request?: SecondParameter<typeof customFetch>;
+}) => {
+  const { query: queryOptions, request: requestOptions } = options ?? {};
+
+  const queryKey = queryOptions?.queryKey ?? getListRolesQueryKey();
+
+  const queryFn: QueryFunction<Awaited<ReturnType<typeof listRoles>>> = ({
+    signal,
+  }) => listRoles({ signal, ...requestOptions });
+
+  return { queryKey, queryFn, ...queryOptions } as UseQueryOptions<
+    Awaited<ReturnType<typeof listRoles>>,
+    TError,
+    TData
+  > & { queryKey: QueryKey };
+};
+
+export type ListRolesQueryResult = NonNullable<
+  Awaited<ReturnType<typeof listRoles>>
+>;
+export type ListRolesQueryError = ErrorType<unknown>;
+
+/**
+ * @summary List roles (admin)
+ */
+
+export function useListRoles<
+  TData = Awaited<ReturnType<typeof listRoles>>,
+  TError = ErrorType<unknown>,
+>(options?: {
+  query?: UseQueryOptions<Awaited<ReturnType<typeof listRoles>>, TError, TData>;
+  request?: SecondParameter<typeof customFetch>;
+}): UseQueryResult<TData, TError> & { queryKey: QueryKey } {
+  const queryOptions = getListRolesQueryOptions(options);
+
+  const query = useQuery(queryOptions) as UseQueryResult<TData, TError> & {
+    queryKey: QueryKey;
+  };
+
+  return { ...query, queryKey: queryOptions.queryKey };
+}
+
 /**
  * @summary List groups (admin)
  */