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.

src/utils/pnl.ts

@@ -13,4 +13,24 @@ export function computePositionPnl(
     : (position.entryPrice - (priceForPnl as number)) * absAmt;
 }
 
+export function computeStopLossPnl(
+  position: PositionSnapshot,
+  bestBid?: number | null,
+  bestAsk?: number | null
+): number | null {
+  const absAmt = Math.abs(position.positionAmt);
+  if (!Number.isFinite(absAmt) || absAmt <= 0) return 0;
+
+  // If entry price is missing, prefer the exchange-provided unrealized PnL.
+  if (!Number.isFinite(position.entryPrice) || position.entryPrice <= 0) {
+    return Number.isFinite(position.unrealizedProfit) ? position.unrealizedProfit : null;
+  }
+
+  const priceForPnl = position.positionAmt > 0 ? bestBid : bestAsk;
+  if (!Number.isFinite(priceForPnl as number) || (priceForPnl as number) <= 0) {
+    return Number.isFinite(position.unrealizedProfit) ? position.unrealizedProfit : null;
+  }
+
+  return computePositionPnl(position, bestBid, bestAsk);
+}