feat(plans): Stage 4 — full admin plan/feature editor

The admin → Plans screen now edits EVERYTHING per plan (the backend already
accepted it; only the UI was partial):
- All limits (orders/day, tables, terminals, branches, menu categories, menu
  items, customers, report history, SMS, AI-3D) with an "unlimited (∞)" toggle.
- Display names (fa/en), monthly price, sort order, billable-online, active on/off.
- Per-plan feature checkboxes grouped by module, plus an "all features (*)" toggle
  (Enterprise). Sourced from the live feature catalog (/api/admin/features).
- Plans listed in sort order (Free·Starter·Pro·Business·Enterprise).
- i18n fa/en/ar.

Admin tsc + build clean.

web/admin/messages/fa.json

@@ -1107,7 +1107,29 @@
       "title": "پلن‌ها و قیمت‌گذاری",
       "monthlyPrice": "قیمت ماهانه (تومان)",
       "maxOrders": "سقف سفارش روزانه",
-      "saved": "پلن ذخیره شد"
+      "saved": "پلن ذخیره شد",
+      "active": "فعال",
+      "nameFa": "نام (فارسی)",
+      "nameEn": "نام (انگلیسی)",
+      "sortOrder": "ترتیب",
+      "billable": "قابل پرداخت آنلاین",
+      "limitsTitle": "محدودیت‌ها",
+      "featuresTitle": "امکانات",
+      "allFeatures": "همه امکانات",
+      "allFeaturesNote": "این پلن به همه امکانات (فعلی و آینده) دسترسی دارد.",
+      "save": "ذخیره",
+      "limits": {
+        "maxOrders": "سفارش روزانه",
+        "maxTables": "میزها",
+        "maxTerminals": "پایانه POS",
+        "maxBranches": "شعب",
+        "maxCategories": "دسته منو",
+        "maxItems": "آیتم منو",
+        "maxCustomers": "مشتریان",
+        "maxReportDays": "تاریخچه گزارش (روز)",
+        "maxSms": "پیامک ماهانه",
+        "maxAi3d": "تولید ۳D ماهانه"
+      }
     },
     "settings": {
       "title": "تنظیمات اپلیکیشن",