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/__main__.py

@@ -10,6 +10,7 @@ Boot:
 from __future__ import annotations
 
 from contextlib import asynccontextmanager
+from typing import Literal, cast
 
 import uvicorn
 from fastapi import FastAPI
@@ -40,7 +41,9 @@ def _make_app(settings: Settings) -> FastAPI:
     app.state.settings = settings
 
     async def builder(exchange: str, env: str):
-        return await build_client(settings, exchange, env)
+        return await build_client(
+            settings, exchange, cast(Literal["testnet", "mainnet"], env)
+        )
 
     app.state.registry = ClientRegistry(builder=builder)
 
@@ -65,7 +68,7 @@ def _make_app(settings: Settings) -> FastAPI:
 
 def main() -> None:
     configure_root_logging()
-    settings = Settings()
+    settings = Settings()  # type: ignore[call-arg]
     app = _make_app(settings)
     uvicorn.run(
         app,