Replace Vazirmatn with a locally-served Peyda font for Persian text.

Vendor the Peyda woff weights (Thin–Black) under public/fonts/peyda and
load them via next/font/local in a shared fonts module, exposed through
the --font-peyda CSS variable and the font-peyda Tailwind utility. Drops
the runtime Google Fonts fetch on the landing and auth pages.

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

frontend/src/app/fonts.ts

@@ -0,0 +1,18 @@
+import localFont from 'next/font/local';
+
+// Peyda — Persian/Arabic typeface served locally from public/fonts/peyda.
+export const peyda = localFont({
+  src: [
+    { path: '../../public/fonts/peyda/Peyda-Thin.woff', weight: '100', style: 'normal' },
+    { path: '../../public/fonts/peyda/Peyda-ExtraLight.woff', weight: '200', style: 'normal' },
+    { path: '../../public/fonts/peyda/Peyda-Light.woff', weight: '300', style: 'normal' },
+    { path: '../../public/fonts/peyda/Peyda-Regular.woff', weight: '400', style: 'normal' },
+    { path: '../../public/fonts/peyda/Peyda-Medium.woff', weight: '500', style: 'normal' },
+    { path: '../../public/fonts/peyda/Peyda-SemiBold.woff', weight: '600', style: 'normal' },
+    { path: '../../public/fonts/peyda/Peyda-Bold.woff', weight: '700', style: 'normal' },
+    { path: '../../public/fonts/peyda/Peyda-ExtraBold.woff', weight: '800', style: 'normal' },
+    { path: '../../public/fonts/peyda/Peyda-Black.woff', weight: '900', style: 'normal' },
+  ],
+  variable: '--font-peyda',
+  display: 'swap',
+});

frontend/src/app/page.tsx

@@ -1,13 +1,7 @@
 import type { Metadata } from 'next';
-import { Vazirmatn } from 'next/font/google';
+import { peyda } from './fonts';
 import { LandingPage } from '@/components/landing/LandingPage';
 
-const vazir = Vazirmatn({
-  subsets: ['arabic'],
-  variable: '--font-vazir',
-  display: 'swap',
-});
-
 export const metadata: Metadata = {
   title: 'ابربان | زیرساخت ابری، در کنترل تو',
   description:
@@ -16,7 +10,7 @@ export const metadata: Metadata = {
 
 export default function Home() {
   return (
-    <div dir="rtl" className={`${vazir.variable} font-vazir`}>
+    <div dir="rtl" className={`${peyda.variable} font-peyda`}>
       <LandingPage />
     </div>
   );