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>

frontend/src/app/dashboard/glossaries/GlossaryCard.tsx

@@ -6,6 +6,7 @@ import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
 import { BookText, Pencil, Trash2 } from 'lucide-react';
 import type { GlossaryListItem } from './types';
+import { useI18n } from '@/lib/i18n';
 
 interface GlossaryCardProps {
   glossary: GlossaryListItem;
@@ -20,6 +21,7 @@ export const GlossaryCard = memo(function GlossaryCard({
   onDelete,
   isDeleting = false,
 }: GlossaryCardProps) {
+  const { t, locale } = useI18n();
   const handleEdit = useCallback(() => {
     onEdit(glossary.id);
   }, [glossary.id, onEdit]);
@@ -28,7 +30,7 @@ export const GlossaryCard = memo(function GlossaryCard({
     onDelete(glossary.id, glossary.name);
   }, [glossary.id, glossary.name, onDelete]);
 
-  const formattedDate = new Date(glossary.created_at).toLocaleDateString('en-US', {
+  const formattedDate = new Date(glossary.created_at).toLocaleDateString(locale === 'fr' ? 'fr-FR' : 'en-US', {
     year: 'numeric',
     month: 'short',
     day: 'numeric',
@@ -46,10 +48,10 @@ export const GlossaryCard = memo(function GlossaryCard({
               <h3 className="font-medium text-foreground truncate">{glossary.name}</h3>
               <div className="flex items-center gap-2 mt-1">
                 <Badge variant="secondary" className="text-xs">
-                  {glossary.terms_count} {glossary.terms_count === 1 ? 'term' : 'terms'}
+                  {glossary.terms_count} {glossary.terms_count === 1 ? t('glossaries.card.term') : t('glossaries.card.terms')}
                 </Badge>
                 <span className="text-xs text-muted-foreground">
-                  Created {formattedDate}
+                  {t('glossaries.card.created')} {formattedDate}
                 </span>
               </div>
             </div>