feat: 添加 Paradex 适配器支持，更新环境变量配置和适配器构建逻辑

tests/config.test.ts

@@ -0,0 +1,46 @@
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { resolveSymbolFromEnv } from "../src/config";
+
+const ORIGINAL_ENV = { ...process.env };
+
+beforeEach(() => {
+  process.env = { ...ORIGINAL_ENV };
+});
+
+afterEach(() => {
+  process.env = { ...ORIGINAL_ENV };
+});
+
+describe("resolveSymbolFromEnv", () => {
+  it("prefers exchange-specific symbol when available", () => {
+    process.env.EXCHANGE = "backpack";
+    process.env.BACKPACK_SYMBOL = "ETHUSDC";
+    process.env.TRADE_SYMBOL = "BTCUSDT";
+
+    expect(resolveSymbolFromEnv()).toBe("ETHUSDC");
+  });
+
+  it("falls back to TRADE_SYMBOL when exchange symbol is missing", () => {
+    process.env.EXCHANGE = "paradex";
+    process.env.TRADE_SYMBOL = "ETH/USDC";
+    delete process.env.PARADEX_SYMBOL;
+
+    expect(resolveSymbolFromEnv()).toBe("ETH/USDC");
+  });
+
+  it("uses exchange-specific fallback when no env is defined", () => {
+    process.env.EXCHANGE = "paradex";
+    delete process.env.PARADEX_SYMBOL;
+    delete process.env.TRADE_SYMBOL;
+
+    expect(resolveSymbolFromEnv()).toBe("BTC/USDC");
+  });
+
+  it("supports resolving symbol for an explicit exchange id", () => {
+    delete process.env.EXCHANGE;
+    process.env.GRVT_SYMBOL = "ETHUSDT";
+
+    expect(resolveSymbolFromEnv("grvt")).toBe("ETHUSDT");
+  });
+});
+