chore: update FUN-Codex and FUN-Claude provider models (#522)

FUN-Codex: add GPT models (5.5, 5.4, 5.4-mini, 5.3-codex, 5.3-codex-spark)
FUN-Claude: replace with actual Claude models from API (opus-4-7 down to 3-5-haiku)

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

packages/client/src/i18n/locales/de.ts

@@ -68,6 +68,7 @@ export default {
   sidebar: {
     chat: 'Chat',
     search: 'Suche',
+    apiRelay: 'API-Relay',
     history: 'Verlauf',
     jobs: 'Geplante Aufgaben',
     models: 'Modelle',