fix(i18n): rename Ollama keys to LiteLLM in all language files

The dashboard code references dashboard.litellm_settings,
dashboard.litellm_url, dashboard.litellm_url_placeholder, and
dashboard.litellm_status but the i18n JSON files still had the
old Ollama key names. Also updates hint/placeholder text to
reference LITELLM_URL / LITELLM_MODEL env vars.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

assets/i18n/fr.json

@@ -58,15 +58,15 @@
     "title": "Tableau de bord",
     "subtitle": "Actualites et mises a jour IA",
     "topic_placeholder": "Nom du sujet...",
-    "ollama_settings": "Parametres Ollama",
-    "settings_hint": "Laissez vide pour utiliser OLLAMA_URL / OLLAMA_MODEL du fichier .env",
-    "ollama_url": "URL Ollama",
-    "ollama_url_placeholder": "Utilise OLLAMA_URL du fichier .env",
+    "litellm_settings": "Parametres LiteLLM",
+    "settings_hint": "Laissez vide pour utiliser LITELLM_URL / LITELLM_MODEL du fichier .env",
+    "litellm_url": "URL LiteLLM",
+    "litellm_url_placeholder": "Utilise LITELLM_URL du fichier .env",
     "model": "Modele",
-    "model_placeholder": "Utilise OLLAMA_MODEL du fichier .env",
+    "model_placeholder": "Utilise LITELLM_MODEL du fichier .env",
     "searching": "Recherche en cours...",
     "search_failed": "Echec de la recherche : {e}",
-    "ollama_status": "Statut Ollama",
+    "litellm_status": "Statut LiteLLM",
     "trending": "Tendances",
     "recent_searches": "Recherches recentes"
   },