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/staff/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 { prisma } from "@/lib/prisma";
@@ -23,6 +24,7 @@ type Team = {
 };
 
 export default async function StaffPage() {
+  const t = await getTranslations("pages.staff");
   const minStaffRank = Number(await siteSettings.get("min_staff_rank", "7")) || 7;
 
   let staff: StaffMember[] = [];
@@ -57,10 +59,10 @@ export default async function StaffPage() {
 
   return (
     <main style={{ display: "grid", gap: "1.5rem" }}>
-      <ContentCard icon="🛡️" title="Staff" subtitle="The team behind the hotel" />
+      <ContentCard icon="🛡️" title={t("title")} subtitle={t("subtitle")} />
 
       {teams.length > 0 ? (
-        <ContentCard icon="⭐" title="Ranks" subtitle="What each part of the team takes care of">
+        <ContentCard icon="⭐" title={t("ranksTitle")} subtitle={t("ranksSubtitle")}>
           <div className="card-grid sm-2 lg-3">
             {teams.map((t) => (
               <div key={t.id} className="card">
@@ -78,23 +80,23 @@ export default async function StaffPage() {
 
       <ContentCard
         icon="👥"
-        title="Team members"
+        title={t("membersTitle")}
         subtitle={
           staff.length === 0
-            ? "Nobody to show right now"
-            : `${staff.length} member${staff.length === 1 ? "" : "s"} keeping things running`
+            ? t("membersEmptySubtitle")
+            : t("membersSubtitle", { count: staff.length })
         }
         padded={staff.length === 0}
       >
         {staff.length === 0 ? (
-          <EmptyState icon="🛡️">No staff members to show.</EmptyState>
+          <EmptyState icon="🛡️">{t("emptyState")}</EmptyState>
         ) : (
           <table>
             <thead>
               <tr>
-                <th>Username</th>
-                <th>Rank</th>
-                <th>Motto</th>
+                <th>{t("colUsername")}</th>
+                <th>{t("colRank")}</th>
+                <th>{t("colMotto")}</th>
               </tr>
             </thead>
             <tbody>