feat: 添加最大平仓滑点配置，更新网格引擎状态持久化逻辑，优化订单管理和状态恢复功能

src/strategy/common/grid-storage.ts

@@ -0,0 +1,58 @@
+import { promises as fs } from "fs";
+import path from "path";
+import type { GridDirection } from "../../config";
+
+const DATA_DIR = process.env.GRID_DATA_DIR?.trim() || path.resolve("data");
+const GRID_FILE = path.resolve(DATA_DIR, "grid-record.json");
+
+export interface StoredGridState {
+  symbol: string;
+  lowerPrice: number;
+  upperPrice: number;
+  gridLevels: number;
+  orderSize: number;
+  maxPositionSize: number;
+  direction: GridDirection;
+  longExposure: Record<string, number>;
+  shortExposure: Record<string, number>;
+  updatedAt: number;
+}
+
+type GridStateMap = Record<string, StoredGridState>;
+
+async function ensureDataDir(): Promise<void> {
+  try {
+    await fs.mkdir(DATA_DIR, { recursive: true });
+  } catch {
+    // ignore
+  }
+}
+
+async function readStateFile(): Promise<GridStateMap> {
+  try {
+    const content = await fs.readFile(GRID_FILE, "utf8");
+    const parsed = JSON.parse(content);
+    if (parsed && typeof parsed === "object") {
+      return parsed as GridStateMap;
+    }
+    return {};
+  } catch (error: any) {
+    if (error && (error.code === "ENOENT" || error.code === "ENOTDIR")) {
+      return {};
+    }
+    throw error;
+  }
+}
+
+export async function loadGridState(symbol: string): Promise<StoredGridState | null> {
+  const map = await readStateFile();
+  const snapshot = map[symbol];
+  return snapshot ?? null;
+}
+
+export async function saveGridState(snapshot: StoredGridState): Promise<void> {
+  await ensureDataDir();
+  const map = await readStateFile();
+  map[snapshot.symbol] = snapshot;
+  await fs.writeFile(GRID_FILE, JSON.stringify(map, null, 2), "utf8");
+}