feat: delete actions for warehouse/reservations/coupons/customers + Koja listing toggle

Delete (every manageable entity that only had "add" now has delete):
- Ingredients (warehouse): new DELETE /inventory/ingredients/{id} (soft-delete via
  the global DeletedAt filter — no FK trouble with recipes/movements) + NoOp stub +
  trash button in the materials cards.
- Reservations: new DELETE /reservations/{id} (soft-delete) + per-card delete button.
- Coupons & Customers: backend DELETE already existed; wired delete buttons in the UI.
- Shared ConfirmDialog component used by all delete flows (RTL-aware).
- Audit result: tables/branches/taxes/kitchen-stations/expenses/menu/terminals already
  had delete; HR has no "add" so no delete needed; shifts intentionally excluded
  (financial open/close records, not add-style entities).

Koja visibility:
- New Cafe.ShowOnKoja flag, default TRUE (DB default true so existing cafés stay
  listed). Discover query now filters IsVerified && !Deleted && ShowOnKoja.
- public-profile GET/PUT expose showOnKoja; dashboard public-profile panel has an
  on-by-default toggle that persists immediately. Platform IsVerified gate unchanged.
- EF migration AddCafeShowOnKoja (defaultValue: true).

Also: added the missing errors.generic i18n key (fa/en/ar) so useApiError's fallback
resolves instead of rendering the literal "errors.generic". 81 API tests pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/dashboard/src/components/coupons/coupons-screen.tsx

@@ -3,24 +3,29 @@
 import { useState } from "react";
 import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
 import { useTranslations } from "next-intl";
-import { Plus } from "lucide-react";
-import { apiGet, apiPost } from "@/lib/api/client";
+import { Plus, Trash2 } from "lucide-react";
+import { apiDelete, apiGet, apiPost } from "@/lib/api/client";
 import type { Coupon, CouponType } from "@/lib/api/types";
 import { useAuthStore } from "@/lib/stores/auth.store";
 import { formatNumber } from "@/lib/format";
+import { notify } from "@/lib/notify";
+import { useApiError } from "@/lib/use-api-error";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { LabeledField } from "@/components/ui/labeled-field";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { Badge } from "@/components/ui/badge";
+import { ConfirmDialog } from "@/components/ui/confirm-dialog";
 
 export function CouponsScreen() {
   const t = useTranslations("coupons");
   const tCommon = useTranslations("common");
+  const apiError = useApiError();
   const cafeId = useAuthStore((s) => s.user?.cafeId);
   const queryClient = useQueryClient();
 
   const [showForm, setShowForm] = useState(false);
+  const [deleteTarget, setDeleteTarget] = useState<Coupon | null>(null);
   const [code, setCode] = useState("");
   const [type, setType] = useState<CouponType>("Percentage");
   const [value, setValue] = useState("10");
@@ -47,6 +52,16 @@ export function CouponsScreen() {
     },
   });
 
+  const deleteCoupon = useMutation({
+    mutationFn: (id: string) => apiDelete(`/api/cafes/${cafeId}/coupons/${id}`),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["coupons", cafeId] });
+      setDeleteTarget(null);
+      notify.success(t("deleted"));
+    },
+    onError: (err) => notify.error(apiError(err)),
+  });
+
   if (!cafeId) return null;
 
   return (
@@ -132,11 +147,34 @@ export function CouponsScreen() {
                   {t("usage")}: {formatNumber(c.usedCount)}
                   {c.usageLimit ? ` / ${formatNumber(c.usageLimit)}` : ""}
                 </p>
+                <div className="mt-2 flex justify-end">
+                  <Button
+                    type="button"
+                    size="sm"
+                    variant="ghost"
+                    className="text-red-600 hover:bg-red-50 hover:text-red-700"
+                    onClick={() => setDeleteTarget(c)}
+                  >
+                    <Trash2 className="me-1.5 size-4" />
+                    {tCommon("delete")}
+                  </Button>
+                </div>
               </CardContent>
             </Card>
           ))}
         </div>
       )}
+
+      <ConfirmDialog
+        open={!!deleteTarget}
+        onOpenChange={(o) => {
+          if (!o) setDeleteTarget(null);
+        }}
+        title={t("deleteConfirmTitle")}
+        description={deleteTarget ? t("deleteConfirmDesc", { code: deleteTarget.code }) : undefined}
+        busy={deleteCoupon.isPending}
+        onConfirm={() => deleteTarget && deleteCoupon.mutate(deleteTarget.id)}
+      />
     </div>
   );
 }