fix: OKX 持仓张数优先读 info.pos，滚仓后同步 order_amount

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/hub/hub_position_metrics.py

@@ -24,23 +24,26 @@ def _coerce_float(*values: Any) -> float | None:
 
 
 def position_contracts(p: dict[str, Any]) -> float:
-    raw = p.get("contracts")
-    if raw is not None:
-        try:
-            return float(raw)
-        except (TypeError, ValueError):
-            pass
     info = p.get("info") or {}
     if not isinstance(info, dict):
         info = {}
-    for k in ("positionAmt", "positionamt", "pos", "size"):
+    # OKX 等：info.pos 为交易所张数，优先于 ccxt contracts（加仓后后者可能滞后）
+    for k in ("pos", "positionAmt", "positionamt", "size"):
         if k in info:
             try:
                 v = float(info[k])
                 if v != 0:
-                    return v
+                    return abs(v)
             except (TypeError, ValueError):
                 pass
+    raw = p.get("contracts")
+    if raw is not None:
+        try:
+            v = float(raw)
+            if v != 0:
+                return abs(v)
+        except (TypeError, ValueError):
+            pass
     return 0.0