ADDED - Admin SEO page, robots/sitemap hardening and media/maintenance security fixes

SEO
- New Settings > SEO admin page (seo_settings in app_config): indexing switch,
  Google/Bing verification, X handle, JSON-LD identity (Person/Organization,
  sameAs), per-locale keywords, readiness checklist and open links for
  sitemap.xml / robots.txt / manifest.
- robots.txt is now dynamic: disallows admin, api, success and coming-soon
  paths; blocks everything while indexing is off or maintenance is on.
- sitemap.xml carries hreflang alternates per URL, lists only categories with
  published projects, and is empty while hidden.
- Metadata: robots + verification meta, og:locale in de_DE/en_US/ar_AR form,
  alternateLocale, twitter site/creator, project cover as OG image with
  article type, noindex on /success and /coming-soon.
- JSON-LD: WebSite + publisher graph on all public pages, CreativeWork per
  project (view-mode independent).

Security
- Maintenance bypass now requires a correctly signed admin cookie; the
  middleware previously only checked the cookie existed. Token helpers moved
  to lib/admin-session-token.ts (shared by proxy.ts and lib/admin-auth.ts).
- Media uploads: magic-byte validation against the declared type, SVG
  sanitization (script/handlers/foreignObject/javascript: rejected), upload
  folder sanitized, kind inferred from the real file.
- Media route: fixed prefix-based path check that accepted sibling
  directories, unknown extensions return 404, nosniff header, CSP sandbox on
  SVG, gif content type added.
- External media URLs: protocol-relative (//host) URLs rejected.

Portfolio
- Project and category slugs share /portfolio/[slug]; saving now rejects a
  slug already used on the other side instead of silently shadowing it.

Tooling/docs
- Lint: ignore scripts/legacy-prisma-seed.cjs, drop unused import.
- New docs/SEO.md; FEATURES, ARCHITECTURE (Drizzle instead of Prisma), admin
  spec and CLAUDE.md updated.
- Tests for all of the above (unit + integration); suite green.

app/[locale]/(site)/layout.tsx

@@ -8,9 +8,11 @@ import { PageTransition } from "@/components/layout/page-transition";
 import { SiteDock } from "@/components/layout/site-dock";
 import { SiteFooter } from "@/components/layout/site-footer";
 import { ScrollSmootherProvider } from "@/components/scroll-smoother-provider";
+import { JsonLd } from "@/components/seo/json-ld";
 import { isSuperAdmin } from "@/lib/admin-auth";
-import { getMaintenanceMode, getSiteSettings } from "@/lib/app-config";
+import { getMaintenanceMode, getSeoSettings, getSiteSettings, getSiteSettingsMediaBindings } from "@/lib/app-config";
 import { getLocalizedPath, resolveLocale } from "@/lib/locale";
+import { buildSiteJsonLd } from "@/lib/metadata";
 
 type SiteLayoutProps = {
   children: ReactNode;
@@ -25,9 +27,11 @@ export const revalidate = 0;
 export default async function SiteLayout({ children, params }: SiteLayoutProps) {
   noStore();
   await params;
-  const [maintenanceEnabled, siteSettings] = await Promise.all([
+  const [maintenanceEnabled, siteSettings, seo, mediaBindings] = await Promise.all([
     getMaintenanceMode(),
     getSiteSettings(),
+    getSeoSettings(),
+    getSiteSettingsMediaBindings(),
   ]);
   const localeKey = resolveLocale(await getLocale().catch(() => siteSettings.defaultLocale), siteSettings.defaultLocale);
   // Server-side decision only. The dock receives just this boolean and uses
@@ -42,6 +46,7 @@ export default async function SiteLayout({ children, params }: SiteLayoutProps)
 
   return (
     <>
+      <JsonLd data={buildSiteJsonLd({ settings: siteSettings, seo, bindings: mediaBindings, locale: localeKey })} />
       <ScrollSmootherProvider />
       <SiteAmbientBackdrop />
       <SiteDock defaultLocale={siteSettings.defaultLocale} isSuperAdmin={authenticated} />

app/[locale]/(site)/portfolio/[slug]/page.tsx

@@ -7,8 +7,9 @@ import { PageHero } from "@/components/layout/page-hero";
 import { PortfolioCategoryFilter } from "@/components/site/portfolio-category-filter";
 import { PortfolioProjectDetail } from "@/components/site/portfolio-project-detail";
 import { PortfolioProjectGrid } from "@/components/site/portfolio-project-grid";
-import { getSiteSettings } from "@/lib/app-config";
-import { buildLocalizedMetadata } from "@/lib/metadata";
+import { JsonLd } from "@/components/seo/json-ld";
+import { getSeoSettings, getSiteSettings } from "@/lib/app-config";
+import { buildLocalizedMetadata, buildProjectJsonLd } from "@/lib/metadata";
 import { resolveLocale } from "@/lib/locale";
 import {
   getActivePortfolioCategories,
@@ -57,6 +58,9 @@ export async function generateMetadata({ params }: PortfolioSlugPageProps): Prom
     pathname: `/portfolio/${slug}`,
     title: getLocalizedValue(resolved.project.title, localeKey),
     description: getLocalizedValue(resolved.project.summary, localeKey),
+    image: resolved.project.coverImagePath,
+    type: "article",
+    publishedTime: resolved.project.publishedAt,
   });
 }
 
@@ -108,13 +112,30 @@ export default async function PortfolioSlugPage({ params }: PortfolioSlugPagePro
   }
 
   const { project: item } = resolved;
-  const t = await getTranslations({ locale: localeKey, namespace: "portfolioDetail" });
+  const [t, seo] = await Promise.all([
+    getTranslations({ locale: localeKey, namespace: "portfolioDetail" }),
+    getSeoSettings(),
+  ]);
   const title = getLocalizedValue(item.title, localeKey);
   const category = getLocalizedValue(item.category.name, localeKey);
   const summary = getLocalizedValue(item.summary, localeKey);
+  const jsonLd = buildProjectJsonLd({
+    settings: siteSettings,
+    seo,
+    locale: localeKey,
+    pathname: `/portfolio/${slug}`,
+    title,
+    description: summary,
+    image: item.coverImagePath,
+    datePublished: item.publishedAt,
+    genre: category,
+    keywords: [getLocalizedValue(item.serviceLabel, localeKey), String(item.projectYear)].filter(Boolean),
+    clientName: item.clientName,
+  });
 
   return (
     <>
+      <JsonLd data={jsonLd} />
       <PageHero
         locale={localeKey}
         badge={category}

app/[locale]/(site)/success/page.tsx

@@ -30,6 +30,7 @@ export async function generateMetadata({ params }: SuccessPageProps): Promise<Me
     pathname: "/success",
     title: t("title"),
     description: t("text"),
+    noIndex: true,
   });
 }