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/components/ui/sonner.tsx

@@ -0,0 +1,25 @@
+'use client'
+
+import { useTheme } from 'next-themes'
+import { Toaster as Sonner, ToasterProps } from 'sonner'
+
+const Toaster = ({ ...props }: ToasterProps) => {
+  const { theme = 'system' } = useTheme()
+
+  return (
+    <Sonner
+      theme={theme as ToasterProps['theme']}
+      className="toaster group"
+      style={
+        {
+          '--normal-bg': 'var(--popover)',
+          '--normal-text': 'var(--popover-foreground)',
+          '--normal-border': 'var(--border)',
+        } as React.CSSProperties
+      }
+      {...props}
+    />
+  )
+}
+
+export { Toaster }