fix(brand): real Meezi icon/favicon on website + admin (was missing)

- web/website: manifest referenced /icon-192.png and /icon-512.png that
  didn't exist (broken favicon). Added the real transparent Meezi mark
  (32/180/192/512) + wired icons into metadata. OG image stays dynamic.
- web/admin: had no metadata or icons at all. Added title template,
  favicon/apple icons (icons/ dir), themeColor, noindex.

Dashboard + Koja already carry the real logo; web apps are now consistent.
Mobile launcher icons will be handled with the Android packaging task.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/admin/src/app/[locale]/layout.tsx

@@ -1,3 +1,4 @@
+import type { Metadata, Viewport } from "next";
 import { NextIntlClientProvider } from "next-intl";
 import { getMessages, setRequestLocale } from "next-intl/server";
 import { notFound } from "next/navigation";
@@ -6,6 +7,27 @@ import { routing } from "@/i18n/routing";
 import { Providers } from "@/components/providers";
 import "../globals.css";
 
+export const metadata: Metadata = {
+  title: { default: "مدیریت سامانه میزی", template: "%s — مدیریت میزی" },
+  description: "پنل مدیریت سامانه میزی",
+  icons: {
+    icon: [
+      { url: "/icons/icon-32.png", sizes: "32x32", type: "image/png" },
+      { url: "/icons/icon-48.png", sizes: "48x48", type: "image/png" },
+      { url: "/icons/icon-192.png", sizes: "192x192", type: "image/png" },
+    ],
+    shortcut: "/icons/icon-32.png",
+    apple: "/icons/icon-180.png",
+  },
+  robots: { index: false, follow: false }, // internal admin panel
+};
+
+export const viewport: Viewport = {
+  themeColor: "#0F6E56",
+  width: "device-width",
+  initialScale: 1,
+};
+
 const vazirmatn = localFont({
   src: "../../fonts/Vazirmatn-Variable.woff2",
   variable: "--font-vazirmatn",