fix: remove DeepSeek/MiniMax branding, fix glossary visibility, improve translate page UX

- US1: Replace exposed provider names (DeepSeek V3 → IA Express, MiniMax → IA Avancée)
  in legacy_routes.py, remove 52 DeepSeek references from i18n pricing/landing keys,
  add generic modelName key across all 13 languages
- US2: Fix glossary selector filtering (fallback to all glossaries when source lang
  filter returns empty), show templates by default, fix 3 broken presets
  (hvac/construction/automotive → hr/scientific/ecommerce)
- US3: Replace 15 hardcoded French strings with i18n t() calls, increase font sizes
  from 8-9px to 11px, improve text contrast (opacity /20→/40, /25→/45, /30→/50)
- US4: Add missing provider labels in admin ProviderStatus (deepseek, minimax, zai,
  google_cloud, openrouter, openrouter_premium)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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

@@ -5,7 +5,7 @@ import {
   BookText, Plus, Library, Calendar, Hash,
   Zap, Save, Trash2, MessageSquare, Loader2,
   Wrench, HardHat, Monitor, Scale, Stethoscope, BarChart3,
-  Megaphone, Car,
+  Megaphone, Car, ShoppingCart, FlaskConical, Users,
 } from 'lucide-react';
 import { useUser } from '@/app/dashboard/useUser';
 import { useI18n } from '@/lib/i18n';
@@ -21,14 +21,14 @@ import { useTranslationStore } from '@/lib/store';
 import { API_BASE } from '@/lib/config';
 
 const PRESETS = [
-  { key: 'hvac', title: 'HVAC / Génie climatique', desc: 'Thermique, ventilation, climatisation', icon: Wrench, templateId: 'hvac' },
-  { key: 'construction', title: 'BTP / Construction', desc: 'Gros œuvre, second œuvre, normes', icon: HardHat, templateId: 'construction' },
   { key: 'it', title: 'IT / Logiciel', desc: 'Développement, infrastructure, DevOps', icon: Monitor, templateId: 'technology' },
   { key: 'legal', title: 'Juridique / Contrats', desc: 'Droit des affaires, contentieux', icon: Scale, templateId: 'legal' },
   { key: 'medical', title: 'Médical / Santé', desc: 'Pharmacologie, chirurgie, diagnostic', icon: Stethoscope, templateId: 'medical' },
   { key: 'finance', title: 'Finance / Comptabilité', desc: 'IFRS, bilans, fiscalité', icon: BarChart3, templateId: 'finance' },
   { key: 'marketing', title: 'Marketing / Publicité', desc: 'Digital, branding, analytics', icon: Megaphone, templateId: 'marketing' },
-  { key: 'automotive', title: 'Automobile', desc: 'Motorisation, ADAS, homologation', icon: Car, templateId: 'automotive' },
+  { key: 'hr', title: 'RH / Ressources Humaines', desc: 'Contrats, politiques, recrutement', icon: Users, templateId: 'hr' },
+  { key: 'scientific', title: 'Scientifique / Recherche', desc: 'Publications, thèses, articles', icon: FlaskConical, templateId: 'scientific' },
+  { key: 'ecommerce', title: 'E-commerce / Vente', desc: 'Boutiques en ligne, catalogues, CRM', icon: ShoppingCart, templateId: 'ecommerce' },
 ];
 
 export default function GlossariesPage() {