feat(V2): migrazione hyperliquid completa

- exchanges/hyperliquid/{client,leverage_cap,tools}.py
- routers/hyperliquid.py con 16 endpoint /mcp-hyperliquid/tools/*
- builder hyperliquid in exchanges/__init__.py
- test migrati: test_client, test_leverage_cap (skip V1: server_acl, environment_info)
- test builder hyperliquid (testnet vs mainnet base_url)

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

src/cerbero_mcp/exchanges/__init__.py

@@ -27,4 +27,13 @@ async def build_client(
             api_secret=settings.bybit.api_secret.get_secret_value(),
             testnet=(env == "testnet"),
         )
+    if exchange == "hyperliquid":
+        from cerbero_mcp.exchanges.hyperliquid.client import HyperliquidClient
+
+        return HyperliquidClient(
+            wallet_address=settings.hyperliquid.wallet_address,
+            private_key=settings.hyperliquid.private_key.get_secret_value(),
+            testnet=(env == "testnet"),
+            api_wallet_address=settings.hyperliquid.api_wallet_address,
+        )
     raise ValueError(f"unsupported exchange: {exchange}")