Fix API URL handling for Docker deployment

- Replace hardcoded localhost URLs with dynamic host detection from request headers
- Supports both development (localhost:3001) and Docker (localhost:9000 -> 3000) environments
- Uses host header to determine correct protocol and port for internal API calls
- Updated execute-dex, validate, and orders APIs to use dynamic baseUrl
- Ensures proper API communication in containerized environments

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

@@ -18,6 +18,11 @@ export async function POST(request) {
       toCoin 
     } = body
 
+    // Get the base URL from the request
+    const host = request.headers.get('host') || 'localhost:3000'
+    const protocol = host.includes('localhost') ? 'http' : 'https'
+    const baseUrl = `${protocol}://${host}`
+
     console.log('🔄 Execute DEX trade request:', { 
       symbol, 
       side, 
@@ -66,7 +71,7 @@ export async function POST(request) {
       console.log('🔍 Validating wallet balance before DEX trade...')
       
       try {
-        const validationResponse = await fetch(`${process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000'}/api/trading/validate`, {
+        const validationResponse = await fetch(`${baseUrl}/api/trading/validate`, {
           method: 'POST',
           headers: { 'Content-Type': 'application/json' },
           body: JSON.stringify({
@@ -197,7 +202,7 @@ export async function POST(request) {
       // Add trade to history with clear spot swap indication
       try {
         // Use localhost for internal container communication
-        await fetch('http://localhost:3001/api/trading/history', {
+        await fetch(`${baseUrl}/api/trading/history`, {
           method: 'POST',
           headers: { 'Content-Type': 'application/json' },
           body: JSON.stringify({