更新 MakerEngine、OffsetMakerEngine 和 TrendEngine，重构订单同步逻辑，优化撤单和止损判断，新增订单计划生成和安全撤单功能，提升代码可读性和维护性。

src/utils/depth.ts

@@ -0,0 +1,42 @@
+import type { AsterDepth } from "../exchanges/types";
+
+export type DepthImbalance = "balanced" | "buy_dominant" | "sell_dominant";
+
+export function computeDepthStats(
+  depth: AsterDepth,
+  levels = 10,
+  ratio = 3
+): {
+  buySum: number;
+  sellSum: number;
+  skipBuySide: boolean;
+  skipSellSide: boolean;
+  imbalance: DepthImbalance;
+} {
+  const topBids = (depth.bids ?? []).slice(0, levels);
+  const topAsks = (depth.asks ?? []).slice(0, levels);
+
+  const buySum = topBids.reduce((total, level) => {
+    const qty = Number(level?.[1]);
+    return Number.isFinite(qty) ? total + qty : total;
+  }, 0);
+
+  const sellSum = topAsks.reduce((total, level) => {
+    const qty = Number(level?.[1]);
+    return Number.isFinite(qty) ? total + qty : total;
+  }, 0);
+
+  const skipSellSide = sellSum === 0 || sellSum * ratio < buySum;
+  const skipBuySide = buySum === 0 || buySum * ratio < sellSum;
+
+  let imbalance: DepthImbalance = "balanced";
+  if (buySum > sellSum * ratio) {
+    imbalance = "buy_dominant";
+  } else if (sellSum > buySum * ratio) {
+    imbalance = "sell_dominant";
+  }
+
+  return { buySum, sellSum, skipBuySide, skipSellSide, imbalance };
+}
+
+