fix: Update trading API routes for enhanced functionality

API Route Improvements:
- Enhanced execute-dex route for better DEX trade execution
- Improved validation route for comprehensive trade validation
- Better error handling and response formatting
- Supporting infrastructure for Jupiter-style trading interface

These changes complement the new chart trading interface with more robust backend processing.

app/api/trading/execute-dex/route.js

@@ -66,7 +66,7 @@ export async function POST(request) {
       console.log('🔍 Validating wallet balance before DEX trade...')
       
       try {
-        const validationResponse = await fetch('http://localhost:3001/api/trading/validate', {
+        const validationResponse = await fetch(`${process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000'}/api/trading/validate`, {
           method: 'POST',
           headers: { 'Content-Type': 'application/json' },
           body: JSON.stringify({

app/api/trading/validate/route.js

@@ -10,7 +10,7 @@ export async function POST(request) {
     // Fetch real wallet balance from the wallet API
     let walletBalance
     try {
-      const walletResponse = await fetch('http://localhost:3001/api/wallet/balance')
+      const walletResponse = await fetch(`${process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000'}/api/wallet/balance`)
       const walletData = await walletResponse.json()
       
       if (walletData.success && walletData.wallet) {