chore(V2): mypy clean — fix radice V2 nuovo + suppress mirato V1 legacy

- settings.py: lambda factory + type:ignore[call-arg] per env-loaded models
- routers/*.py (6 file): cast esplicito Environment / Client per request.state
- __main__.py: cast Literal env in builder, type:ignore Settings()
- server.py: type:ignore[method-assign] su app.openapi
- deribit/tools.py: assert su validator-normalized fields, list return type
- deribit/client.py: type:ignore mirato no-any-return / has-type, rinomina types→types_list
- hyperliquid/{client,tools}.py: assert su validator-normalized fields, var-annotated
- alpaca/client.py: type:ignore mirato per SDK quirks (assignment, no-any-return, arg-type, union-attr)
- {macro,sentiment}/fetchers.py: type:ignore mirato no-any-return / operator / union-attr

Mypy: 68 → 0 errors. Test: 259 passing. Ruff: clean.

src/cerbero_mcp/exchanges/sentiment/fetchers.py

@@ -134,7 +134,7 @@ async def fetch_crypto_news(api_key: str = "", limit: int = 20) -> dict[str, Any
             providers_failed.append(name)
             continue
         providers_ok.append(name)
-        for item in res:
+        for item in res:  # type: ignore[union-attr]
             if "provider" not in item:
                 item["provider"] = name
             all_items.append(item)
@@ -643,7 +643,7 @@ async def fetch_oi_history(asset: str = "BTC", period: str = "5m", limit: int =
         past = next((p for p in reversed(points) if p["timestamp"] <= cutoff_ts), None)
         if past is None or past["oi"] == 0:
             return None
-        return round(100.0 * (current["oi"] - past["oi"]) / past["oi"], 3)
+        return round(100.0 * (current["oi"] - past["oi"]) / past["oi"], 3)  # type: ignore[no-any-return]
 
     return {
         "asset": asset,