fix(okx): show negative unrealized PnL on strategy page

Parse signed upl/unrealizedPnl from CCXT positions and fall back to calc_pnl when exchange metrics are missing.

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

crypto_monitor_okx/app.py

@@ -2789,10 +2789,12 @@ def parse_ccxt_position_metrics(position, order_leverage=None):
                     initial = approx
         except (TypeError, ValueError):
             pass
-    unrealized = _coerce_float(
+    unrealized = _coerce_float_signed(
         p.get("unrealizedPnl"),
         info.get("upl"),
+        info.get("uplLast"),
         info.get("unrealized_pnl"),
+        info.get("unrealisedPnl"),
     )
     mark = _coerce_float(p.get("markPrice"), p.get("mark_price"), info.get("markPx"))
     out = {}
@@ -3996,6 +3998,7 @@ def calc_price_diff_pct(current_price, target_price):
 
 
 def _coerce_float(*values):
+    """取第一个可解析且 > 0 的数（用于价格、保证金等）。"""
     for v in values:
         if v is None:
             continue
@@ -4008,6 +4011,20 @@ def _coerce_float(*values):
     return None
 
 
+def _coerce_float_signed(*values):
+    """取第一个有限浮点数（含 0 与负数），用于未实现盈亏等。"""
+    for v in values:
+        if v is None or v == "":
+            continue
+        try:
+            f = float(v)
+            if math.isfinite(f):
+                return f
+        except (TypeError, ValueError):
+            continue
+    return None
+
+
 def _sqlite_row_val(row, key, default=None):
     try:
         v = row[key]