Add dark mode, i18n, messenger/moderation/verify, admin CRUD parity

Web-tier features completing the AtomCMS→Next.js conversion (slice 2):

UI/UX:
- Dark mode: html.dark CSS-var overrides + ThemeSwitcher (localStorage,
  no-flash boot script) wired into the nav.
- i18n (next-intl, cookie-based / no URL routing): en + it catalogs,
  request.ts, provider in root layout, LanguageSwitcher; shell (nav,
  header, footer) fully translated. URLs + access-guard unchanged.
- globals.css: --muted/--border aliases used across admin pages.

User features:
- /messages: offline messages + friend-request accept (server action
  re-reads session, two directional rows, idempotent).
- Email verification: signed-token /verify route + sendVerification wired
  into register (best-effort, never blocks signup).
- Article reactions: toggle UI on news/[slug] + server action.
- Content moderation service (website_wordfilter + optional OpenAI
  moderations, fail-open) wired into article comments + guestbook.

Admin CRUD parity (Filament replacement):
- /admin/shop (+ new/[id]) packages CRUD + read-only orders.
- /admin/transactions read-only PayPal log.
- /admin/permissions, /admin/tags, /admin/ads (+ new/[id]),
  /admin/help-questions (+ new/[id]), /admin/radio/history,
  /admin/users/[id]/edit. All gated by requireStaff + logStaffActivity.

Verified: tsc 0, vitest 48/48, next build 0 (all routes incl. new
admin CRUD + /messages + /verify).

src/messages/en.json

@@ -0,0 +1,39 @@
+{
+  "nav": {
+    "home": "Home",
+    "community": "Community",
+    "articles": "Articles",
+    "photos": "Photos",
+    "staff": "Staff",
+    "rankings": "Rankings",
+    "guilds": "Guilds",
+    "leaderboards": "Leaderboards",
+    "rareValues": "Rare values",
+    "shop": "Shop",
+    "market": "Market",
+    "assistance": "Assistance",
+    "helpCenter": "Help center",
+    "myTickets": "My tickets",
+    "badges": "Badges",
+    "radio": "Radio",
+    "friends": "Friends",
+    "messages": "Messages",
+    "admin": "Admin"
+  },
+  "header": {
+    "online": "{count} {hotel} online",
+    "nitroClient": "Nitro client",
+    "tagline": "An online virtual world where you can create your own avatar, make friends, chat, create rooms and much more!",
+    "login": "Login",
+    "or": "Or",
+    "createAccount": "Create an account"
+  },
+  "footer": {
+    "copyright": "© {year} - {hotel} is a not for profit educational project"
+  },
+  "common": {
+    "language": "Language",
+    "lightMode": "Light mode",
+    "darkMode": "Dark mode"
+  }
+}

src/messages/it.json

@@ -0,0 +1,39 @@
+{
+  "nav": {
+    "home": "Home",
+    "community": "Community",
+    "articles": "Articoli",
+    "photos": "Foto",
+    "staff": "Staff",
+    "rankings": "Classifiche",
+    "guilds": "Gruppi",
+    "leaderboards": "Classifiche",
+    "rareValues": "Valori rari",
+    "shop": "Negozio",
+    "market": "Mercato",
+    "assistance": "Assistenza",
+    "helpCenter": "Centro assistenza",
+    "myTickets": "I miei ticket",
+    "badges": "Distintivi",
+    "radio": "Radio",
+    "friends": "Amici",
+    "messages": "Messaggi",
+    "admin": "Admin"
+  },
+  "header": {
+    "online": "{count} online su {hotel}",
+    "nitroClient": "Client Nitro",
+    "tagline": "Un mondo virtuale online dove puoi creare il tuo avatar, fare amicizia, chattare, creare stanze e molto altro!",
+    "login": "Accedi",
+    "or": "Oppure",
+    "createAccount": "Crea un account"
+  },
+  "footer": {
+    "copyright": "© {year} - {hotel} è un progetto educativo senza scopo di lucro"
+  },
+  "common": {
+    "language": "Lingua",
+    "lightMode": "Tema chiaro",
+    "darkMode": "Tema scuro"
+  }
+}