关键位现价改与顶栏同源公开行情，前端无价时回退 nav tickers。

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

app.py

@@ -2591,7 +2591,10 @@ def get_available_trading_usdt():
 
 
 def get_synced_leverage(exchange_symbol, direction):
-    ensure_markets_loaded()
+    try:
+        ensure_markets_loaded()
+    except Exception:
+        return None
     # 1) 优先读取交易所杠杆配置
     try:
         if hasattr(exchange, "fetch_leverage"):
@@ -4178,34 +4181,49 @@ def sync_trade_records_from_exchange(conn, force=False):
 
 # 获取实时价格
 def get_price(symbol):
-    """最新价:优先 ccxt 永续 ticker;失败则走 OKX 公开接口(模拟盘无密钥也能显示)."""
-    ex_sym = ""
+    """最新价:公开 SWAP/现货 ticker 优先(与顶栏同源),再回退 ccxt."""
+    sym = normalize_symbol_input(symbol) or (symbol or "").strip().upper()
+    base = ""
+    if "/" in sym:
+        base = sym.split("/", 1)[0].strip().upper()
+    elif sym:
+        base = sym.split(":", 1)[0].strip().upper()
+    # 1) 与顶栏 BTC/ETH 同一公开接口(模拟盘无密钥也可用)
+    if base in ("BTC", "ETH"):
+        try:
+            from lib.market.nav_spot_tickers_lib import _ticker_row
+
+            for inst in (f"{base}-USDT-SWAP", f"{base}-USDT"):
+                row = _ticker_row(exchange, inst)
+                if not row:
+                    continue
+                last = _safe_float(row.get("last") or row.get("lastPx") or row.get("markPx"))
+                if last is not None and last > 0:
+                    return float(last)
+        except Exception:
+            pass
+    # 2) 其它币种:公开 ticker
+    if base and hasattr(exchange, "public_get_market_ticker"):
+        try:
+            for inst in (f"{base}-USDT-SWAP", f"{base}-USDT"):
+                rows = (exchange.public_get_market_ticker({"instId": inst}) or {}).get("data") or []
+                if not rows:
+                    continue
+                row = rows[0] or {}
+                last = _safe_float(row.get("last") or row.get("lastPx") or row.get("markPx"))
+                if last is not None and last > 0:
+                    return float(last)
+        except Exception:
+            pass
+    # 3) ccxt 永续
     try:
-        ex_sym = normalize_okx_symbol(symbol)
         ensure_markets_loaded()
-        last = exchange.fetch_ticker(ex_sym).get("last")
-        if last is not None:
+        last = exchange.fetch_ticker(normalize_okx_symbol(sym or symbol)).get("last")
+        last = _safe_float(last)
+        if last is not None and last > 0:
             return float(last)
     except Exception:
         pass
-    try:
-        sym = normalize_symbol_input(symbol) or (symbol or "").strip().upper()
-        base = (sym.split("/")[0] if "/" in sym else sym.split(":")[0]).strip().upper()
-        if not base:
-            return None
-        # SWAP 与现货公开 ticker 均可作为关键位现价
-        for inst in (f"{base}-USDT-SWAP", f"{base}-USDT"):
-            if not hasattr(exchange, "public_get_market_ticker"):
-                break
-            rows = (exchange.public_get_market_ticker({"instId": inst}) or {}).get("data") or []
-            if not rows:
-                continue
-            row = rows[0] or {}
-            last = row.get("last") or row.get("lastPx") or row.get("markPx")
-            if last is not None and float(last) > 0:
-                return float(last)
-    except Exception:
-        pass
     return None
 
 # 获取5分钟K线收盘价
@@ -6186,8 +6204,14 @@ def api_order_defaults():
     if direction not in ("long", "short"):
         direction = "long"
     exchange_symbol = normalize_okx_symbol(symbol)
-    leverage = get_synced_leverage(exchange_symbol, direction) or infer_leverage(symbol)
-    available = get_available_trading_usdt()
+    try:
+        leverage = get_synced_leverage(exchange_symbol, direction) or infer_leverage(symbol)
+    except Exception:
+        leverage = infer_leverage(symbol)
+    try:
+        available = get_available_trading_usdt()
+    except Exception:
+        available = None
     last_price = get_price(symbol)
     return jsonify({
         "ok": True,