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/page.tsx

@@ -1,3 +1,4 @@
+import { getTranslations } from "next-intl/server";
 import Link from "next/link";
 import { ContentCard, EmptyState } from "@/components/public/ui";
 import { excerpt } from "@/lib/format";
@@ -7,6 +8,7 @@ import { siteSettings } from "@/lib/services/site-settings";
 export const dynamic = "force-dynamic";
 
 export default async function HomePage() {
+  const t = await getTranslations("pages.home");
   const hotelName = (await siteSettings.get("hotel_name", "Atom")) ?? "Atom";
 
   let articles: Array<{ slug: string; title: string; shortStory: string; image: string }> = [];
@@ -24,34 +26,34 @@ export default async function HomePage() {
     <main style={{ display: "grid", gap: "1.5rem" }}>
       <ContentCard
         icon="🏨"
-        title={`Welcome to ${hotelName}`}
-        subtitle="Your retro hotel, now powered by Next.js"
+        title={t("welcome", { hotelName })}
+        subtitle={t("welcomeSubtitle")}
       >
         <p className="muted" style={{ margin: "0 0 0.9rem" }}>
-          Hang out, collect furni, and meet friends.
+          {t("welcomeBody")}
         </p>
         <div style={{ display: "flex", gap: "0.6rem", flexWrap: "wrap" }}>
           <Link className="btn btn-primary" href="/client">
-            Enter hotel
+            {t("enterHotel")}
           </Link>
           <Link className="btn btn-outline" href="/news">
-            Latest news
+            {t("latestNews")}
           </Link>
         </div>
       </ContentCard>
 
       <ContentCard
         icon="📰"
-        title="Latest news"
-        subtitle="Fresh from the hotel"
+        title={t("newsTitle")}
+        subtitle={t("newsSubtitle")}
         action={
           <Link className="btn btn-outline" href="/news">
-            All news →
+            {t("allNews")}
           </Link>
         }
       >
         {articles.length === 0 ? (
-          <EmptyState icon="📰">No articles yet.</EmptyState>
+          <EmptyState icon="📰">{t("noArticles")}</EmptyState>
         ) : (
           <div className="card-grid sm-2 lg-4">
             {articles.map((a) => (