lint: ruff clean services/ (autofix + manual + ignore E741)

- 24 autofix safe (SIM105 contextlib.suppress, F401 unused imports,
  I001 import order, B007 unused loop var, F811 redef, F841 unused).
- 15 unsafe-fix (UP038 X|Y in isinstance, SIM108 ternary, ecc.).
- Manual fix: SIM102 nested if in deribit term_structure, E402 imports
  in test_cot.py + sentiment server.py.
- Ignore E741 (variabili 'l' in list comprehensions deribit/client.py
  — stilistico, non bug).

Tests: 478/478 verdi.

services/mcp-macro/tests/test_server_acl.py

@@ -127,7 +127,6 @@ def test_get_market_overview_no_auth_401(http):
     assert r.status_code == 401
 
 
-from unittest.mock import AsyncMock, patch
 
 
 def test_get_cot_tff_core_ok(http):