fix: прижать футер к низу на всех страницах (flex min-h-screen)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/[lang]/layout.tsx

@@ -23,12 +23,12 @@ export default async function LangLayout({
 }) {
   const { lang } = await params
   return (
-    <>
+    <div className="flex flex-col min-h-screen">
       <Header lang={lang} />
-      <main>{children}</main>
+      <main className="flex-1">{children}</main>
       <Footer lang={lang} />
       <FloatingContacts />
       <ScrollToTop />
-    </>
+    </div>
   )
 }