Serve the site in English, Spanish and Arabic, add a captcha, make the message optional

- Move every route under app/[lang]; a proxy keeps English on unprefixed URLs and serves /es and /ar
- Interface strings and homepage copy per locale; content pages load a translated JSON when one exists
- Language switch in the header, hreflang alternates and a multilingual sitemap
- Right-to-left layout for Arabic with logical CSS properties, Noto Sans Arabic and no letter-spacing
- Self-hosted proof-of-work "I'm not a robot" check (no third-party account) replaces Turnstile
- The message field is optional; failed attempts refill the form instead of clearing it

src/components/logo.tsx

@@ -1,9 +1,9 @@
 import Link from "next/link";
 import Image from "next/image";
 
-export default function Logo() {
+export default function Logo({ href, label }: { href: string; label: string }) {
   return (
-    <Link href="/" className="logo" aria-label="AI Growth Technologies — home">
+    <Link href={href} className="logo" aria-label={label}>
       <Image className="logo-mark" src="/logo-mark.png" alt="" width={229} height={192} priority />
       <span className="logo-type">
         <b>AI GROWTH</b>
@@ -13,9 +13,9 @@ export default function Logo() {
   );
 }
 
-export function LogoStacked() {
+export function LogoStacked({ href, label }: { href: string; label: string }) {
   return (
-    <Link href="/" className="logo-stacked" aria-label="AI Growth Technologies — home">
+    <Link href={href} className="logo-stacked" aria-label={label}>
       <Image src="/logo-stacked.png" alt="AI Growth Technologies" width={480} height={547} />
     </Link>
   );