fix: switch Big Pickle -> DeepSeek V4 Flash (censorship)

- Big Pickle (opencode/zen free) censura contenuti fantasy
  con "User Safety: safe" - blocca la narrazione del DM
- DeepSeek V4 Flash su opencode/go: $0.14/M token,
  nessuna censura, descrizioni fantasy corrette
- Aggiornati .env, start.sh, config.py

start.sh

@@ -16,9 +16,9 @@ export DCC_OPENROUTER_KEY="${DCC_OPENROUTER_KEY:-}"
 export DCC_OPENROUTER_MODEL="${DCC_OPENROUTER_MODEL:-openrouter/free}"
 export DCC_OLLAMA_URL="${DCC_OLLAMA_URL:-http://192.168.0.50:11434}"
 export DCC_OLLAMA_MODEL="${DCC_OLLAMA_MODEL:-gemma2:9b}"
-export DCC_LOCAL_URL="${DCC_LOCAL_URL:-https://opencode.ai/zen/v1}"
+export DCC_LOCAL_URL="${DCC_LOCAL_URL:-https://opencode.ai/zen/go/v1}"
 export DCC_LOCAL_KEY="${DCC_LOCAL_KEY:-}"
-export DCC_LOCAL_MODEL="${DCC_LOCAL_MODEL:-big-pickle}"
+export DCC_LOCAL_MODEL="${DCC_LOCAL_MODEL:-deepseek-v4-flash}"
 
 # ── create data dir ────────────────────────────────────────────────
 mkdir -p data