fix: collector WebSocket trade parsing + DuckDB 1.5 API compatibility

data/collectors/hyperliquid.py:
- Fixed _handle_trades to handle HL WebSocket trade data as list[dict]
  (each trade dict has its own 'coin' field) instead of assuming single dict
- Fixed _poll_funding and _poll_open_interest to guard against
  data[0] being list vs dict (mainnet vs testnet response format difference)

data/duckdb_load.py:
- Replaced deprecated duckdb.from_sequence() with executemany() for
  l2_snapshots, trades, and funding table inserts (DuckDB 1.5.x API)

Tick runner verified on real mainnet BTC data:
- 324 events (45 L2 + 279 trades), VPIN-gated A-S MM, 1 trade, 98 cancels
- HFT dashboard generated with 8 panels from real tick data

data/collectors/hyperliquid.py

@@ -268,12 +268,12 @@ class HyperliquidCollector:
         )
         self._latency.record_transport(time_ms, local_ts)
 
-    async def _handle_trades(self, data: dict, local_ts: float):
-        coin = data.get("coin", "?")
-        if coin not in self._coins:
-            return
+    async def _handle_trades(self, data: dict | list, local_ts: float):
         trade_list = data if isinstance(data, list) else [data]
         for trade in trade_list:
+            coin = trade.get("coin", "?") if isinstance(trade, dict) else "?"
+            if coin not in self._coins:
+                continue
             time_ms = normalize_timestamp(trade.get("time"), source="hl")
             self._store.push(
                 channel="trades",
@@ -311,7 +311,11 @@ class HyperliquidCollector:
                     async with session.post(self._api_url, json={"type": "metaAndAssetCtxs"}, timeout=aiohttp.ClientTimeout(total=10)) as resp:
                         data = await resp.json()
                     if isinstance(data, list) and len(data) >= 2:
-                        universe = data[0].get("universe", [])
+                        raw_universe = data[0]
+                        if isinstance(raw_universe, dict):
+                            universe = raw_universe.get("universe", [])
+                        else:
+                            universe = raw_universe if isinstance(raw_universe, list) else []
                         ctxs = data[1]
                         now_ms = int(time.time() * 1000)
                         for i, asset_info in enumerate(universe):
@@ -357,7 +361,11 @@ class HyperliquidCollector:
                     async with session.post(self._api_url, json={"type": "metaAndAssetCtxs"}, timeout=aiohttp.ClientTimeout(total=10)) as resp:
                         data = await resp.json()
                     if isinstance(data, list) and len(data) >= 2:
-                        universe = data[0].get("universe", [])
+                        raw_universe = data[0]
+                        if isinstance(raw_universe, dict):
+                            universe = raw_universe.get("universe", [])
+                        else:
+                            universe = raw_universe if isinstance(raw_universe, list) else []
                         ctxs = data[1]
                         now_ms = int(time.time() * 1000)
                         for i, asset_info in enumerate(universe):