feat(companies): onboard co-operative unions and farms

They hold a TIN but no business licence, so there is no eTrade record to look
their registration up in. A checkbox on the first wizard step marks them, and
everything that assumed a trade licence bends around it:

- The company step replaces the eTrade lookup with typed registration details
  — name, region, zone, woreda, kebele, house number — required exactly because
  they are now on screen. applyEtradeSourcedFields skips the lookup rather than
  failing it, so what the customer sends is what is stored.
- No freight-forwarder role. Forwarding is licensed work, so the option is not
  offered, and the API refuses it at start-onboarding and at every later
  role-add rather than letting approval fail on a document they cannot produce.
- No per-role business-licence upload, client-side or in the completion gate.
- Their own document set (company_onboarding_documents_cooperative) merges on
  top of the nationality one, admin-managed like every other set. Nationality
  wins a fileKey collision so no slot renders twice, and the DARS paper is not
  injected into it — the set it merges onto already carries one.
- The owner is typed in full; with no eTrade manager on file the licence
  comparison reports "nothing to compare against", which backoffice now
  explains rather than leaving as a bare dash.

Stored as an attributes flag, not a column: everything it changes is
behavioural, and nothing queries or joins on it.

apps/edr-freight-web/backoffice/src/hooks/useStampSettings.ts

@@ -0,0 +1,45 @@
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { useTranslation } from "react-i18next";
+import { toast } from "sonner";
+
+import { stampSettingsService } from "@/services/stampSettings.service";
+import { useErrorHandler } from "@/shared/hooks/useErrorHandler";
+
+const QUERY_KEY = ["stampSettings"];
+
+export const useStampSettingsQuery = () =>
+  useQuery({
+    queryKey: QUERY_KEY,
+    queryFn: () => stampSettingsService.get(),
+  });
+
+export const useSetStamp = () => {
+  const queryClient = useQueryClient();
+  const { t } = useTranslation();
+  const { handleError } = useErrorHandler(t);
+
+  return useMutation({
+    mutationFn: (stampImageBase64: string) =>
+      stampSettingsService.set(stampImageBase64),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: QUERY_KEY });
+      toast.success(t("stampSettings.updated", "Company stamp updated"));
+    },
+    onError: handleError,
+  });
+};
+
+export const useClearStamp = () => {
+  const queryClient = useQueryClient();
+  const { t } = useTranslation();
+  const { handleError } = useErrorHandler(t);
+
+  return useMutation({
+    mutationFn: () => stampSettingsService.clear(),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: QUERY_KEY });
+      toast.success(t("stampSettings.cleared", "Company stamp removed"));
+    },
+    onError: handleError,
+  });
+};