Refactor triggerType handling in order placement logic

- Updated the triggerType assignment in placeStopLossOrder and related functions to default to "STOP_LOSS" instead of conditionally setting it based on the order side.
- This change simplifies the logic for stop market orders across the order coordinator and GRVT exchange gateway, ensuring consistent behavior.

src/core/order-coordinator.ts

@@ -296,7 +296,7 @@ export async function placeStopLossOrder(
       timeInForce: "GTC",
       reduceOnly: true,
       closePosition: true,
-      triggerType: side === "BUY" ? "TAKE_PROFIT" : "STOP_LOSS",
+      triggerType: "STOP_LOSS",
     });
     pendings[type] = String(order.orderId);
     log("stop", `挂止损单: ${side} STOP_MARKET @ ${normalizedStop}`);

src/exchanges/grvt/gateway.ts

@@ -1337,7 +1337,7 @@ function buildUnsignedOrder(params: {
 
 function buildTriggerMetadata(params: CreateOrderParams): GrvtUnsignedOrder["metadata"]["trigger"] | undefined {
   if (params.type === "STOP_MARKET") {
-    const triggerType = params.triggerType ?? (params.side === "BUY" ? "TAKE_PROFIT" : "STOP_LOSS");
+    const triggerType = params.triggerType ?? "STOP_LOSS";
     const stopPrice = params.stopPrice ?? params.activationPrice;
     if (!stopPrice) {
       throw new Error("GRVT stop orders require a stopPrice or activationPrice");

src/exchanges/grvt/order.ts

@@ -62,7 +62,7 @@ export async function createStopOrder(intent: StopOrderIntent): Promise<AsterOrd
       quantity: intent.quantity,
       stopPrice: intent.stopPrice,
       timeInForce: intent.timeInForce ?? "GTC",
-      triggerType: intent.triggerType ?? (intent.side === "BUY" ? "TAKE_PROFIT" : "STOP_LOSS"),
+      triggerType: intent.triggerType ?? "STOP_LOSS",
       closePosition: toStringBoolean(intent.closePosition ?? true),
       reduceOnly: toStringBoolean(intent.reduceOnly ?? true),
     },