feat: production deployment - full update with providers, admin, glossaries, pricing, tests

Major changes across backend, frontend, infrastructure:
- Provider system with model selection (Google, DeepL, OpenAI, Ollama, Google Cloud)
- Admin panel: user management, pricing, settings
- Glossary system with CSV import/export
- Subscription and tier quota management
- Security hardening (rate limiting, API key auth, path traversal fixes)
- Docker compose for dev, prod, and IONOS deployment
- Alembic migrations for new tables
- Frontend: dashboard, pricing page, landing page, i18n (en/fr)
- Test suite and verification scripts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

office-translator-landing-page/app/page.tsx

@@ -0,0 +1,20 @@
+import { SiteHeader } from "@/components/site-header"
+import { HeroSection } from "@/components/hero-section"
+import { TranslationCard } from "@/components/translation-card"
+
+export default function Home() {
+  return (
+    <div className="flex min-h-screen flex-col">
+      <SiteHeader />
+      <main className="flex flex-1 flex-col">
+        <HeroSection />
+        <TranslationCard />
+      </main>
+      <footer className="border-t border-border py-6 text-center text-xs text-muted-foreground">
+        <div className="mx-auto max-w-5xl px-6">
+          Office Translator &middot; Enterprise-grade document translation &middot; SOC 2 Compliant
+        </div>
+      </footer>
+    </div>
+  )
+}