Enhance environment variable parsing and account snapshot validation

- Introduced `normalizeEnvValue` function to improve handling of environment variable values, including trimming, unquoting, and stripping inline comments.
- Updated `resolveSymbolFromEnv` and parsing functions to utilize the new normalization logic.
- Added `validateAccountSnapshotForSymbol` function to validate account snapshots, ensuring numeric fields are correctly formatted and flagging any issues.
- Implemented tests for environment variable parsing and account snapshot validation to ensure robustness and correctness.

tests/pnl-stoploss.test.ts

@@ -0,0 +1,39 @@
+import { describe, expect, it } from "vitest";
+import { computeStopLossPnl } from "../src/utils/pnl";
+
+describe("computeStopLossPnl", () => {
+  it("falls back to exchange-provided unrealized PnL when entryPrice is missing", () => {
+    const pnl = computeStopLossPnl(
+      { positionAmt: 1, entryPrice: 0, unrealizedProfit: -2000, markPrice: null },
+      40000,
+      40010
+    );
+    expect(pnl).toBe(-2000);
+  });
+
+  it("uses best bid/ask when entryPrice is available", () => {
+    const longPnl = computeStopLossPnl(
+      { positionAmt: 1, entryPrice: 100, unrealizedProfit: -5, markPrice: null },
+      90,
+      91
+    );
+    expect(longPnl).toBe(-10);
+
+    const shortPnl = computeStopLossPnl(
+      { positionAmt: -2, entryPrice: 100, unrealizedProfit: -5, markPrice: null },
+      95,
+      105
+    );
+    expect(shortPnl).toBe(-10);
+  });
+
+  it("falls back to exchange-provided unrealized PnL when best prices are unavailable", () => {
+    const pnl = computeStopLossPnl(
+      { positionAmt: 1, entryPrice: 100, unrealizedProfit: -123, markPrice: null },
+      null,
+      null
+    );
+    expect(pnl).toBe(-123);
+  });
+});
+