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/messages/en.json

@@ -21,31 +21,11 @@
     "errorGeneric": "Something went wrong. Please try again."
   },
   "errors": {
-    "generic": "Something went wrong. Please try again.",
-    "REQUEST_FAILED": "Request failed. Please try again.",
-    "VALIDATION_ERROR": "The information entered is invalid.",
-    "FORBIDDEN": "You don't have permission to do this.",
-    "OWNER_REQUIRED": "Only the café owner can do this.",
-    "MANAGER_REQUIRED": "This action requires manager access.",
-    "PLAN_LIMIT_REACHED": "You've reached your plan limit. Upgrade to continue.",
-    "PLAN_FEATURE_DISABLED": "This feature isn't available on your current plan.",
-    "NOT_FOUND": "Not found.",
-    "ORDER_NOT_FOUND": "Order not found.",
-    "ITEM_NOT_FOUND": "Item not found.",
-    "ITEM_ALREADY_VOIDED": "This item is already voided.",
-    "ORDER_ALREADY_CLOSED": "This order is already closed.",
-    "TABLE_OCCUPIED": "This table is currently occupied.",
-    "TABLE_CLEANING": "This table is being cleaned.",
-    "TABLE_NOT_FOUND": "Table not found.",
-    "TABLE_HAS_OPEN_ORDER": "This table has an open order and can't be removed.",
-    "TABLE_SECTION_HAS_TABLES": "This section has tables and can't be removed.",
-    "BRANCH_NOT_FOUND": "Branch not found.",
-    "SECTION_NOT_FOUND": "Section not found.",
-    "RATE_LIMITED": "Too many requests. Please wait a moment.",
-    "SMS_FAILED": "Could not send the SMS. Please try again.",
-    "INVALID_OTP": "Invalid or expired verification code.",
-    "TICKET_CLOSED": "This ticket is closed and can't receive messages.",
-    "ALREADY_REGISTERED": "An account already exists for this number. Please sign in."
+    "planLimit": "Plan limit reached. Please upgrade.",
+    "notFound": "Not found",
+    "unauthorized": "Unauthorized",
+    "network": "Network error",
+    "generic": "Something went wrong. Please try again."
   },
   "brand": {
     "name": "Meezi"
@@ -419,7 +399,10 @@
         "duplicatePhone": "This phone number is already registered.",
         "generic": "Could not save. Please try again."
       }
-    }
+    },
+    "deleted": "Customer deleted",
+    "deleteConfirmTitle": "Delete customer",
+    "deleteConfirmDesc": "Delete “{name}”?"
   },
   "coupons": {
     "title": "Coupons",
@@ -435,7 +418,10 @@
       "FixedAmount": "Fixed amount",
       "FreeItem": "Free item"
     },
-    "noCoupons": "No coupons yet"
+    "noCoupons": "No coupons yet",
+    "deleted": "Coupon deleted",
+    "deleteConfirmTitle": "Delete coupon",
+    "deleteConfirmDesc": "Delete coupon “{code}”?"
   },
   "hr": {
     "title": "Human resources",
@@ -932,7 +918,10 @@
     "purchasesThisMonth": "Material purchases this month",
     "purchaseCount": "{count} purchases",
     "viewInExpenses": "View in expenses",
-    "selectBranchForPurchases": "Select a branch in the top bar to record warehouse purchases."
+    "selectBranchForPurchases": "Select a branch in the top bar to record warehouse purchases.",
+    "deleted": "Material deleted",
+    "deleteConfirmTitle": "Delete material",
+    "deleteConfirmDesc": "Delete “{name}”? This can’t be undone."
   },
   "qr": {
     "brand": "Meezi",
@@ -1048,7 +1037,10 @@
       "Cancelled": "Cancelled",
       "Seated": "Seated",
       "Completed": "Completed"
-    }
+    },
+    "deleted": "Reservation deleted",
+    "deleteConfirmTitle": "Delete reservation",
+    "deleteConfirmDesc": "Delete the reservation for “{name}”?"
   },
   "branchesPage": {
     "title": "Branches",
@@ -1476,12 +1468,6 @@
       }
     }
   },
-  "errors": {
-    "planLimit": "Plan limit reached. Please upgrade.",
-    "notFound": "Not found",
-    "unauthorized": "Unauthorized",
-    "network": "Network error"
-  },
   "discoverPublic": {
     "brand": "Meezi",
     "title": "Discover cafés",
@@ -1586,7 +1572,9 @@
     "save": "Save",
     "saved": "Saved",
     "saveFailed": "Save failed",
-    "loading": "Loading…"
+    "loading": "Loading…",
+    "showOnKoja": "Show on Koja",
+    "showOnKojaHint": "List your café in the public Koja directory (koja.meezi.ir). On by default."
   },
   "discoverProfile": {
     "sections": {