feat: Add on-chain TP/SL order placement

- Add placeExitOrders() to create reduce-only LIMIT orders for TP1, TP2, and SL
- Orders now visible in Drift UI
- Tested with real tiny position (0 base x 5x = 0)
- All 3 exit orders placed successfully on-chain
- Position manager continues monitoring as backup
- Added test script and results documentation

app/api/trading/execute/route.ts

@@ -7,7 +7,7 @@
 
 import { NextRequest, NextResponse } from 'next/server'
 import { initializeDriftService } from '@/lib/drift/client'
-import { openPosition } from '@/lib/drift/orders'
+import { openPosition, placeExitOrders } from '@/lib/drift/orders'
 import { normalizeTradingViewSymbol } from '@/config/trading'
 import { getMergedConfig } from '@/config/trading'
 import { getPositionManager, ActiveTrade } from '@/lib/trading/position-manager'
@@ -192,9 +192,7 @@ export async function POST(request: NextRequest): Promise<NextResponse<ExecuteTr
     
     console.log('✅ Trade added to position manager for monitoring')
 
-    // TODO: Save trade to database (add Prisma integration later)
-    
-    
+    // Create response object
     const response: ExecuteTradeResponse = {
       success: true,
       positionId: openResult.transactionSignature,
@@ -212,6 +210,35 @@ export async function POST(request: NextRequest): Promise<NextResponse<ExecuteTr
       timestamp: new Date().toISOString(),
     }
 
+    // Place on-chain TP/SL orders so they appear in Drift UI (reduce-only LIMIT orders)
+    try {
+      const exitRes = await placeExitOrders({
+        symbol: driftSymbol,
+        positionSizeUSD: positionSizeUSD,
+        tp1Price,
+        tp2Price,
+        stopLossPrice,
+        tp1SizePercent: config.takeProfit1SizePercent || 50,
+        tp2SizePercent: config.takeProfit2SizePercent || 100,
+        direction: body.direction,
+      })
+
+      if (!exitRes.success) {
+        console.error('❌ Failed to place on-chain exit orders:', exitRes.error)
+      } else {
+        console.log('📨 Exit orders placed on-chain:', exitRes.signatures)
+      }
+
+      // Attach signatures to response when available
+      if (exitRes.signatures && exitRes.signatures.length > 0) {
+        ;(response as any).exitOrderSignatures = exitRes.signatures
+      }
+    } catch (err) {
+      console.error('❌ Unexpected error placing exit orders:', err)
+    }
+
+    // TODO: Save trade to database (add Prisma integration later)
+
     console.log('✅ Trade executed successfully!')
     
     return NextResponse.json(response)