Add initial funds to fleet stats and color total PnL.

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

control/backend/app/api/nodes.py

@@ -304,6 +304,7 @@ async def _collect_one_stats(node: dict[str, Any]) -> dict[str, Any]:
         "name": node["name"],
         "ok": False,
         "error": None,
+        "initial_funds": None,
         "latest_funds": None,
         "groups": None,
         "fees_perp": None,
@@ -345,9 +346,18 @@ async def _collect_one_stats(node: dict[str, Any]) -> dict[str, Any]:
     if latest_funds is None:
         latest_funds = 0.0
 
+    initial_funds = data.get("initial_funds")
+    if initial_funds is None:
+        # 旧版策略机：用最新资金 − 已实现盈亏近似初始资金
+        try:
+            initial_funds = float(latest_funds) - float(data.get("total_pnl") or 0)
+        except Exception:
+            initial_funds = None
+
     base.update(
         {
             "ok": True,
+            "initial_funds": initial_funds,
             "latest_funds": latest_funds,
             "groups": data.get("groups"),
             "fees_perp": data.get("fees_perp"),