Move fleet stats to nav page; backfill funds and loss metrics from curve/status.

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

control/backend/app/api/nodes.py

@@ -278,6 +278,26 @@ async def node_status(
     return await _collect_one_status(node)
 
 
+def _max_single_loss_from_curve(curve: list[Any]) -> float:
+    pnls = [float(x.get("realized_pnl") or 0) for x in curve if isinstance(x, dict)]
+    if not pnls:
+        return 0.0
+    worst = min(pnls)
+    return float(worst) if worst < 0 else 0.0
+
+
+def _loss_streak_from_curve(curve: list[Any]) -> int:
+    streak = 0
+    for item in reversed(curve):
+        if not isinstance(item, dict):
+            continue
+        if float(item.get("realized_pnl") or 0) < 0:
+            streak += 1
+        else:
+            break
+    return streak
+
+
 async def _collect_one_stats(node: dict[str, Any]) -> dict[str, Any]:
     base = {
         "id": node["id"],
@@ -304,16 +324,37 @@ async def _collect_one_stats(node: dict[str, Any]) -> dict[str, Any]:
     if code >= 400 or not isinstance(data, dict):
         base["error"] = _http_detail(data) if data else f"HTTP {code}"
         return base
+
+    curve = data.get("equity_curve") if isinstance(data.get("equity_curve"), list) else []
+    max_loss = data.get("max_single_loss")
+    if max_loss is None:
+        max_loss = _max_single_loss_from_curve(curve)
+    loss_streak = data.get("loss_streak")
+    if loss_streak is None:
+        loss_streak = _loss_streak_from_curve(curve)
+
+    latest_funds = data.get("latest_funds")
+    if latest_funds is None:
+        # 旧版策略机 stats 无资金字段：回落 status.latest_funds
+        try:
+            sc, sd = await call_node(node, "GET", "/api/fleet/status", timeout=8.0)
+            if sc < 400 and isinstance(sd, dict) and sd.get("latest_funds") is not None:
+                latest_funds = sd.get("latest_funds")
+        except Exception:
+            pass
+    if latest_funds is None:
+        latest_funds = 0.0
+
     base.update(
         {
             "ok": True,
-            "latest_funds": data.get("latest_funds"),
+            "latest_funds": latest_funds,
             "groups": data.get("groups"),
             "fees_perp": data.get("fees_perp"),
             "fees_option": data.get("fees_option"),
             "total_fees": data.get("total_fees"),
-            "max_single_loss": data.get("max_single_loss"),
-            "loss_streak": data.get("loss_streak"),
+            "max_single_loss": max_loss,
+            "loss_streak": loss_streak,
             "total_pnl": data.get("total_pnl"),
             "mode": data.get("mode"),
         }