Fix: Calculate P&L correctly for external closures

- Save currentSize before it becomes 0 in external closure detection
- Use sizeBeforeClosure for P&L calculation instead of trade.currentSize
- Prevents /bin/bash.00 P&L for TP2 exits when position closes externally
- Ensures win/loss analytics counts TP trades correctly

lib/trading/position-manager.ts

@@ -282,6 +282,9 @@ export class PositionManager {
         // Position closed externally (by on-chain TP/SL order)
         console.log(`⚠️ Position ${trade.symbol} was closed externally (by on-chain order)`)
         
+        // Save currentSize before it becomes 0
+        const sizeBeforeClosure = trade.currentSize
+        
         // Determine exit reason based on price
         let exitReason: 'TP1' | 'TP2' | 'SL' | 'SOFT_SL' | 'HARD_SL' = 'SL'
         
@@ -304,14 +307,14 @@ export class PositionManager {
           }
         }
         
-        // Calculate final P&L
+        // Calculate final P&L using size BEFORE closure
         const profitPercent = this.calculateProfitPercent(
           trade.entryPrice,
           currentPrice,
           trade.direction
         )
         const accountPnL = profitPercent * trade.leverage
-        const realizedPnL = (trade.currentSize * accountPnL) / 100
+        const realizedPnL = (sizeBeforeClosure * accountPnL) / 100
         
         // Update database
         const holdTimeSeconds = Math.floor((Date.now() - trade.entryTime) / 1000)