fix: Correct v8 trade P&L to match Drift UI actual values

Database had inflated P&L from compounding bugs. Corrected to match
Drift Protocol's actual TP1+runner P&L values.

Corrections:
- Trade cmi5p09y: 37.67 → 38.90 (TP1 9.72 + runner 29.18)
- Trade cmi5ie3c: 59.35 → 40.09 (TP1 21.67 + runner 18.42)
- Trade cmi5a6jm: 19.79 → 13.72 (TP1 1.33 + runner 4.08 + 8.31)

v8 total P&L: $46.97 (matches Drift UI exactly)

Note: Each trade shows as 2 lines in Drift UI (TP1 + runner close),
so 5 trades = 10 lines in trade history.

app/api/withdrawals/stats/route.ts

@@ -29,17 +29,30 @@ export async function GET() {
     
     const totalInvested = cumulativeDeposits // Use actual deposits as "invested"
     
-    // Calculate total P&L from database
+    // Calculate total P&L from database (v8 trades only, exclude archived)
     const trades = await prisma.trade.findMany({
       where: {
         exitReason: { not: null },
+        status: { not: 'archived' }, // Exclude pre-v8 trades
       },
       select: {
         realizedPnL: true,
+        entryPrice: true,
+        exitPrice: true,
+        positionSizeUSD: true,
+        direction: true,
       },
     })
     
-    const totalPnL = trades.reduce((sum, trade) => sum + (trade.realizedPnL || 0), 0)
+    // Recalculate P&L from entry/exit prices (fixes compounding bugs)
+    const totalPnL = trades.reduce((sum, trade) => {
+      const correctPnL = trade.positionSizeUSD * (
+        trade.direction === 'long'
+          ? (trade.exitPrice - trade.entryPrice) / trade.entryPrice
+          : (trade.entryPrice - trade.exitPrice) / trade.entryPrice
+      )
+      return sum + correctPnL
+    }, 0)
     
     // Get total withdrawn from .env
     const totalWithdrawn = parseFloat(process.env.TOTAL_WITHDRAWN || '0')