Allow CoinOX to start without manual_trading_hub by stubbing hub settings imports.

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

lib/hub/hub_calculator_market_lib.py

@@ -13,7 +13,15 @@ from urllib.parse import urlencode
 try:
     from settings_store import enabled_exchanges, load_settings
 except ImportError:
-    from manual_trading_hub.settings_store import enabled_exchanges, load_settings
+    try:
+        from manual_trading_hub.settings_store import enabled_exchanges, load_settings
+    except ImportError:
+        # CoinOX 独立实例无中控:精度函数仍可用;中控拉实例行情相关 API 不可用
+        def load_settings() -> dict[str, Any]:
+            return {"exchanges": []}
+
+        def enabled_exchanges() -> list:
+            return []
 
 MARKET_CACHE: dict[str, tuple[float, dict[str, Any]]] = {}
 MARKET_LOCK = threading.Lock()