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/de.json

@@ -58,15 +58,15 @@
     "title": "Dashboard",
     "subtitle": "KI-Nachrichten und Neuigkeiten",
     "topic_placeholder": "Themenname...",
-    "ollama_settings": "Ollama-Einstellungen",
-    "settings_hint": "Leer lassen, um OLLAMA_URL / OLLAMA_MODEL aus .env zu verwenden",
-    "ollama_url": "Ollama-URL",
-    "ollama_url_placeholder": "Verwendet OLLAMA_URL aus .env",
+    "litellm_settings": "LiteLLM-Einstellungen",
+    "settings_hint": "Leer lassen, um LITELLM_URL / LITELLM_MODEL aus .env zu verwenden",
+    "litellm_url": "LiteLLM-URL",
+    "litellm_url_placeholder": "Verwendet LITELLM_URL aus .env",
     "model": "Modell",
-    "model_placeholder": "Verwendet OLLAMA_MODEL aus .env",
+    "model_placeholder": "Verwendet LITELLM_MODEL aus .env",
     "searching": "Suche laeuft...",
     "search_failed": "Suche fehlgeschlagen: {e}",
-    "ollama_status": "Ollama-Status",
+    "litellm_status": "LiteLLM-Status",
     "trending": "Im Trend",
     "recent_searches": "Letzte Suchen"
   },