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/radio/schedule/page.tsx

@@ -1,3 +1,4 @@
+import { getTranslations } from "next-intl/server";
 import { ContentCard, EmptyState } from "@/components/public/ui";
 import { prisma } from "@/lib/prisma";
 
@@ -32,6 +33,8 @@ type Slot = {
 };
 
 export default async function RadioSchedulePage() {
+  const t = await getTranslations("pages.radioSchedule");
+
   const schedules = await prisma.radioSchedules
     .findMany({
       where: { isActive: true },
@@ -76,21 +79,21 @@ export default async function RadioSchedulePage() {
     <main style={{ display: "grid", gap: "1.5rem" }}>
       <ContentCard
         icon="🗓️"
-        title="Radio Schedule"
-        subtitle="Our weekly line-up of DJs and shows"
+        title={t("title")}
+        subtitle={t("subtitle")}
       />
 
       <ContentCard padded={!hasAny}>
         {!hasAny ? (
-          <EmptyState icon="🗓️">No shows scheduled yet.</EmptyState>
+          <EmptyState icon="🗓️">{t("empty")}</EmptyState>
         ) : (
           <table>
             <thead>
               <tr>
-                <th>Day</th>
-                <th>Time</th>
-                <th>DJ</th>
-                <th>Show</th>
+                <th>{t("colDay")}</th>
+                <th>{t("colTime")}</th>
+                <th>{t("colDj")}</th>
+                <th>{t("colShow")}</th>
               </tr>
             </thead>
             <tbody>
@@ -103,7 +106,7 @@ export default async function RadioSchedulePage() {
                         <strong>{day}</strong>
                       </td>
                       <td colSpan={3} className="muted">
-                        No shows
+                        {t("noShows")}
                       </td>
                     </tr>
                   );