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

start.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+DIR="$(cd "$(dirname "$0")" && pwd)"
+cd "$DIR"
+
+# ── load .env if present ────────────────────────────────────────────
+if [[ -f .env ]]; then
+    set -a; source .env; set +a
+fi
+
+# ── provider: openrouter | ollama | local ──────────────────────────
+# Per OpenCode API: export DCC_LLM_PROVIDER=local  + set DCC_LOCAL_KEY
+export DCC_LLM_PROVIDER="${DCC_LLM_PROVIDER:-local}"
+export DCC_OPENROUTER_KEY="${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/go/v1}"
+export DCC_LOCAL_KEY="${DCC_LOCAL_KEY:-}"
+export DCC_LOCAL_MODEL="${DCC_LOCAL_MODEL:-deepseek-v4-flash}"
+
+# ── create data dir ────────────────────────────────────────────────
+mkdir -p data
+
+# ── install deps if missing ────────────────────────────────────────
+if ! pip show fastapi &>/dev/null 2>&1; then
+    echo "→ Installing Python dependencies..."
+    pip install --quiet -e .
+fi
+
+# ── start server ───────────────────────────────────────────────────
+echo "→ DCC RPG — AI Dungeon Master"
+echo "   Provider: ${DCC_LLM_PROVIDER}"
+echo "   http://0.0.0.0:8300"
+echo ""
+python -m src.web.server