33d8e275e7
Estende ModelTier a 5 livelli (S/A/B/C/D) con routing automatico: S/A/B via Anthropic SDK, C/D via OpenRouter (OpenAI SDK). Aggiunge prezzi per tier S (Opus), A (Sonnet placeholder) e D (Llama). Refactor LLMClient.complete con dispatch tramite tier_models map e helper _call_anthropic / _call_openrouter. Settings esposte per tutti e 5 i modelli env-configurabili. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>