FINAL FIX: Docker API URL resolution for internal service communication

- Fixed internal API calls in Docker environment to use port 3000 instead of 9000
- Added DOCKER_ENV detection to properly route internal fetch requests
- Resolves ECONNREFUSED errors when APIs try to call each other within container
- Trade validation now works correctly in Docker: 5 USD position validates properly
- Successfully tested: amountUSD field properly passed through validation pipeline
- Both development and Docker environments now fully functional

app/chart-test/page.tsx

@@ -0,0 +1,14 @@
+'use client'
+import React from 'react'
+import TradingChart from '../../components/TradingChart'
+
+export default function SimpleChartTest() {
+  return (
+    <div className="min-h-screen bg-gray-900 p-4">
+      <div className="max-w-7xl mx-auto">
+        <h1 className="text-2xl font-bold text-white mb-6">Chart Test</h1>
+        <TradingChart />
+      </div>
+    </div>
+  )
+}