chore(V2): cleanup quality gate

- ruff: contextlib.suppress al posto di try/except/pass (client_registry, test_env_routing)
- rimozione services/ legacy (residuo da git rm)
- fix integration test fixture: rimosso sys.modules.pop che inquinava module references nei test successivi (test_audit, test_client_init_default_http)

254 test passano. Ruff: clean. Mypy: 68 warning preesistenti dal codice V1 migrato (strict=false).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/cerbero_mcp/__main__.py

@@ -18,7 +18,12 @@ from cerbero_mcp.client_registry import ClientRegistry
 from cerbero_mcp.common.logging import configure_root_logging
 from cerbero_mcp.exchanges import build_client
 from cerbero_mcp.routers import (
-    alpaca, bybit, deribit, hyperliquid, macro, sentiment,
+    alpaca,
+    bybit,
+    deribit,
+    hyperliquid,
+    macro,
+    sentiment,
 )
 from cerbero_mcp.server import build_app
 from cerbero_mcp.settings import Settings