i18n: translate all public page bodies (EN + IT)

Internationalised the ~44 public pages with next-intl (the shell was
already translated). Each page now pulls its copy from a "pages.<slug>"
namespace via getTranslations (server) / useTranslations (client); the
EN + IT catalogs were authored by parallel agents and merged centrally,
with natural Italian (ICU plurals) and it backfilled from en for any
gap. request.ts gained getMessageFallback/onError so a missing key
degrades to the English value, never a raw key.

Behaviour unchanged (only display text moved to t() calls; queries,
actions, fields, ContentCard structure preserved). Verified on the prod
server: with NEXT_LOCALE=it, home/community/staff/news/shop/rankings all
render Italian copy, no raw-key leakage; English unchanged. The nav
language switcher toggles EN/IT live. tsc 0, vitest 49/49, next build 0.

Admin pages intentionally left in English (staff tooling).

src/app/banned/page.tsx

@@ -1,3 +1,4 @@
+import { getTranslations } from "next-intl/server";
 import { ContentCard } from "@/components/public/ui";
 import { auth } from "@/lib/auth";
 import { prisma } from "@/lib/prisma";
@@ -7,6 +8,7 @@ export const dynamic = "force-dynamic";
 const FAR_FUTURE = Math.floor(Date.now() / 1000) + 50 * 365 * 24 * 3600;
 
 export default async function BannedPage() {
+  const t = await getTranslations("pages.banned");
   const session = await auth();
   let reason = "";
   let expire = 0;
@@ -31,21 +33,23 @@ export default async function BannedPage() {
     expire === 0
       ? ""
       : expire > FAR_FUTURE
-        ? "This ban is permanent."
-        : `Expires ${new Date(expire * 1000).toISOString().slice(0, 16).replace("T", " ")}.`;
+        ? t("permanent")
+        : t("expires", {
+            date: new Date(expire * 1000).toISOString().slice(0, 16).replace("T", " "),
+          });
 
   return (
     <main style={{ maxWidth: 560, margin: "2rem auto" }}>
-      <ContentCard icon="🚫" title="You are banned" subtitle="Account suspended">
-        <p style={{ marginTop: 0 }}>Your account has been suspended from the hotel.</p>
+      <ContentCard icon="🚫" title={t("title")} subtitle={t("subtitle")}>
+        <p style={{ marginTop: 0 }}>{t("body")}</p>
         {reason ? (
           <p>
-            <strong>Reason:</strong> {reason}
+            <strong>{t("reasonLabel")}</strong> {reason}
           </p>
         ) : null}
         {expiryText ? <p className="muted">{expiryText}</p> : null}
         <p className="muted" style={{ marginBottom: 0 }}>
-          If you believe this is a mistake, contact the staff team.
+          {t("contactStaff")}
         </p>
       </ContentCard>
     </main>