feat(portfolio): metodi Cerbero v2 (get_historical_v2, get_instruments, get_ticker_batch)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/portfolio/test_cerbero_v2.py

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+import pytest
+from src.live.cerbero_client import CerberoClient
+
+
+@pytest.mark.network
+def test_get_historical_v2_shape():
+    cli = CerberoClient()
+    candles = cli.get_historical_v2("BTC-PERPETUAL", "2026-05-25", "2026-05-27", "1h")
+    assert len(candles) > 0
+    c0 = candles[0]
+    assert {"timestamp", "open", "high", "low", "close", "volume"} <= set(c0)
+
+
+@pytest.mark.network
+def test_get_instruments_returns_list():
+    cli = CerberoClient()
+    inst = cli.get_instruments("ETH", "future")
+    assert isinstance(inst, list) and len(inst) > 0