Make the resume bilingual and part of the shared site chrome

Adds a Russian version (data/resume.ru.json, default language) with an RU/EN
switch stored under the key shared with the front page and the portfolio.
The top bar becomes the site-wide one (brand, Resume, Portfolio, Gitea,
Contact, language, theme) with a second row of anchors for this page's
sections, and the fonts move to Unbounded and Onest so the three pages share
one type system. Portfolio links now point at /portfolio/.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XtcZtnG4GQA1d6mW5PNrS9

app/layout.tsx

@@ -1,25 +1,28 @@
 import type { Metadata } from 'next'
-import localFont from 'next/font/local'
 import './globals.css'
 
-// Both fonts are bundled (SIL Open Font License), so building never depends on the network.
-const display = localFont({ src: './fonts/BricolageGrotesque-Variable.woff2', variable: '--font-display', weight: '200 800', display: 'swap' })
-const text = localFont({ src: './fonts/InstrumentSans-Variable.woff2', variable: '--font-text', weight: '400 700', display: 'swap' })
-
 export const metadata: Metadata = {
-  title: 'Emil Shanayev — Resume',
-  description: 'Resume of Emil Shanayev: backend, DevOps, AI systems, scientific software and game technology.',
-  authors: [{ name: 'Emil Shanayev' }],
+  title: 'Эмиль Шанаев — Резюме',
+  description: 'Резюме Эмиля Шанаева: бэкенд, DevOps, системы на базе ИИ, научное ПО и игровые технологии.',
+  authors: [{ name: 'Эмиль Шанаев' }],
 }
 
-// Dark is the default theme; a stored choice of "light" is applied before the first paint so the page never flashes.
-const THEME_SCRIPT = "try{if(localStorage.getItem('theme')==='light')document.documentElement.dataset.theme='light'}catch(e){}"
+// Before the first paint: the language (the stored choice, otherwise Russian) and the theme (dark unless "light" was
+// chosen). Both keys are shared with the rest of shanaty.ru, so a choice carries over between the pages.
+const BOOT_SCRIPT = `try{var d=document.documentElement,l=localStorage.getItem('lang');if(l!=='ru'&&l!=='en')l='ru';d.dataset.lang=l;d.lang=l;if(localStorage.getItem('theme')==='light')d.dataset.theme='light';document.title=d.getAttribute('data-title-'+l)||document.title}catch(e){}`
 
 export default function RootLayout({ children }: Readonly<{ children: React.ReactNode }>) {
   return (
-    <html lang="en" data-theme="dark" className={`${display.variable} ${text.variable}`} suppressHydrationWarning>
+    <html
+      lang="ru"
+      data-lang="ru"
+      data-theme="dark"
+      data-title-ru="Эмиль Шанаев — Резюме"
+      data-title-en="Emil Shanayev — Resume"
+      suppressHydrationWarning
+    >
       <head>
-        <script dangerouslySetInnerHTML={{ __html: THEME_SCRIPT }} />
+        <script dangerouslySetInnerHTML={{ __html: BOOT_SCRIPT }} />
       </head>
       <body>{children}</body>
     </html>