feat(sms): bring-your-own-provider — cafés use their own SMS account

The platform no longer sells SMS. Each café saves its OWN Kavenegar API
key + sender line (new Cafes columns + migration) and campaigns are sent
and billed through that account.

Backend:
- GET/PUT /sms/settings (Manager/Owner; key echoed masked, verified
  against the provider before saving)
- campaign + balance use the café's credentials; SMS_NOT_CONFIGURED
  error when missing; plan-tier SMS gating removed everywhere
  (PlanLimitChecker, SmsMarketingService, billing status)
- platform Kavenegar config stays ONLY for login OTPs (env/DB)
- design-time DbContext factory so `dotnet ef migrations add` works
  without booting the host

Dashboard:
- SMS screen: provider-settings card, not-configured callout, campaign
  form disabled until configured; quota bar removed (usage stays as info)
- subscription screen + plan comparison no longer show SMS limits

Admin panel:
- Kavenegar/SMS section removed from integrations (request field now
  optional; stored OTP config untouched)
- SMS limit field removed from the plan editor
- nav label "درگاه و پیامک" → "درگاه پرداخت و AI"

fa/en/ar translations. 86 tests pass; all tsc clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/admin/messages/fa.json

@@ -1020,7 +1020,7 @@
       "title": "مدیریت سامانه",
       "dashboard": "داشبورد",
       "plans": "اشتراک و قیمت",
-      "integrations": "درگاه و پیامک",
+      "integrations": "درگاه پرداخت و AI",
       "notifications": "اعلان‌ها",
       "settings": "تنظیمات اپ",
       "features": "قابلیت‌ها",

web/admin/src/components/admin/admin-screens.tsx

@@ -143,7 +143,7 @@ const LIMIT_FIELDS: { key: keyof PlanLimitsData; label: string }[] = [
   { key: "maxMenuItems", label: "maxItems" },
   { key: "maxCustomers", label: "maxCustomers" },
   { key: "maxReportHistoryDays", label: "maxReportDays" },
-  { key: "maxSmsPerMonth", label: "maxSms" },
+  // No SMS limit — marketing SMS is bring-your-own-provider per café.
   { key: "maxMenuAi3dPerMonth", label: "maxAi3d" },
 ];
 
@@ -701,11 +701,6 @@ export function AdminIntegrationsScreen() {
     hasStoredClientSecret: prev?.hasStoredClientSecret ?? false,
     ...patch,
   });
-  const [kavenegar, setKavenegar] = useState({
-    isEnabled: true,
-    apiKey: "",
-    otpTemplate: "verify",
-  });
   const [openAi, setOpenAi] = useState({
     isEnabled: false,
     apiKey: "",
@@ -722,11 +717,6 @@ export function AdminIntegrationsScreen() {
     if (!data) return;
     setActiveGateway(data.activePaymentGateway);
     setGateways(data.paymentGateways.map((g) => ({ ...g })));
-    setKavenegar({
-      isEnabled: data.kavenegar.isEnabled,
-      apiKey: data.kavenegar.apiKey ?? "",
-      otpTemplate: data.kavenegar.otpTemplate,
-    });
     setOpenAi({
       isEnabled: data.ai.openAi.isEnabled,
       apiKey: data.ai.openAi.apiKey ?? "",
@@ -770,7 +760,7 @@ export function AdminIntegrationsScreen() {
                 }
               : undefined,
         })),
-        kavenegar,
+        // SMS is bring-your-own-provider per café — no platform SMS config here.
         ai: { openAi, meshy },
       }),
     onSuccess: () => {
@@ -998,39 +988,6 @@ export function AdminIntegrationsScreen() {
         ))}
       </section>
 
-      <section className="space-y-3">
-        <p className="text-[11px] font-medium uppercase tracking-[0.06em] text-muted-foreground">
-          {t("kavenegarTitle")}
-        </p>
-        <Card className="rounded-xl border border-border/80 p-4 space-y-3">
-          <div className="flex items-center gap-2 text-sm">
-            <Toggle
-              checked={kavenegar.isEnabled}
-              onChange={(v) => setKavenegar((k) => ({ ...k, isEnabled: v }))}
-            />
-            <span>{t("enabled")}</span>
-          </div>
-          <label className="block text-sm">
-            {t("apiKey")}
-            <Input
-              className="mt-1"
-              type="password"
-              placeholder={data?.kavenegar.hasStoredApiKey ? "••••••••" : ""}
-              value={kavenegar.apiKey}
-              onChange={(e) => setKavenegar((k) => ({ ...k, apiKey: e.target.value }))}
-            />
-          </label>
-          <label className="block text-sm">
-            {t("otpTemplate")}
-            <Input
-              className="mt-1"
-              value={kavenegar.otpTemplate}
-              onChange={(e) => setKavenegar((k) => ({ ...k, otpTemplate: e.target.value }))}
-            />
-          </label>
-        </Card>
-      </section>
-
       <section className="space-y-3">
         <p className="text-[11px] font-medium uppercase tracking-[0.06em] text-muted-foreground">
           {t("aiTitle")}