fix: JSON repair, WS thread pool, switch to DeepSeek V4 Flash, funnel Lv0

LLM fixes:
- _try_repair_json() — ripara JSON malformato (apici, virgole trailing)
- _strip_json_from_text() — rimuove residui JSON dalla narration
- parse_tool_call() — rimuove troncamento 200 caratteri dal fallback

DM fixes:
- Fallback euristico quando params vuoti (dm.py)
- Estrazione narrazione da dm_override/narrate params.params.text

Prompt (prompts.py):
- Vietati termini tecnici/scientifici/anacronistici (HPLC, laser, ...)
- Aggiunto vocabolario fantasy obbligatorio

Server (server.py):
- dm_cycle in ThreadPoolExecutor per non bloccare WS ping
- WebSocketDisconnect gestiti
- Rimosso import inesistente db_schema

Frontend (index.html):
- Nascosti tool name dalla chat
- Personaggio -> PG, connessioni aree con nomi

Infrastruttura:
- Switch da openrouter/free a DeepSeek V4 Flash via OpenCode Go
- pyproject.toml, Dockerfile, docker-compose.yml, start.sh
- .env auto-load (start.sh)
- Funnel Lv0 (funnel.py) — creazione PG livello 0

Docs: architecture, database, setup, game mechanics, codebase ref

docker-compose.yml

@@ -0,0 +1,21 @@
+version: "3.9"
+
+services:
+  dcc-rpg:
+    build: .
+    container_name: dcc-rpg
+    ports:
+      - "8300:8300"
+    volumes:
+      - ./data:/app/data
+    environment:
+      - DCC_LLM_PROVIDER=${DCC_LLM_PROVIDER:-local}
+      - DCC_OPENROUTER_KEY=${DCC_OPENROUTER_KEY:-}
+      - DCC_OPENROUTER_MODEL=${DCC_OPENROUTER_MODEL:-openrouter/free}
+      - DCC_OLLAMA_URL=${DCC_OLLAMA_URL:-http://192.168.0.50:11434}
+      - DCC_OLLAMA_MODEL=${DCC_OLLAMA_MODEL:-gemma2:9b}
+      - DCC_LOCAL_URL=${DCC_LOCAL_URL:-https://opencode.ai/zen/go/v1}
+      - DCC_LOCAL_KEY=${DCC_LOCAL_KEY:-}
+      - DCC_LOCAL_MODEL=${DCC_LOCAL_MODEL:-deepseek-v4-flash}
+      - DCC_LLM_TIMEOUT=${DCC_LLM_TIMEOUT:-180}
+    restart: unless-stopped