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/minimal-chart/page.tsx

@@ -0,0 +1,78 @@
+'use client'
+import React, { useEffect, useRef, useState } from 'react'
+
+export default function MinimalChartTest() {
+  const chartContainerRef = useRef<HTMLDivElement>(null)
+  const [status, setStatus] = useState('Starting...')
+  const [error, setError] = useState<string | null>(null)
+
+  useEffect(() => {
+    if (!chartContainerRef.current) {
+      setStatus('No container ref')
+      return
+    }
+
+    const initChart = async () => {
+      try {
+        setStatus('Loading lightweight-charts...')
+        console.log('Starting chart init...')
+        
+        const LightweightCharts = await import('lightweight-charts')
+        console.log('Lightweight charts loaded:', LightweightCharts)
+        setStatus('Charts library loaded')
+        
+        const { createChart, CandlestickSeries } = LightweightCharts
+        console.log('createChart:', typeof createChart)
+        console.log('CandlestickSeries:', CandlestickSeries)
+        
+        setStatus('Creating chart...')
+        const chart = createChart(chartContainerRef.current!, {
+          width: 800,
+          height: 400,
+        })
+        console.log('Chart created:', chart)
+        setStatus('Chart created')
+        
+        setStatus('Adding series...')
+        const series = chart.addSeries(CandlestickSeries, {})
+        console.log('Series created:', series)
+        setStatus('Series added')
+        
+        setStatus('Adding data...')
+        const data = [
+          { time: '2025-01-01', open: 100, high: 110, low: 90, close: 105 },
+          { time: '2025-01-02', open: 105, high: 115, low: 95, close: 110 },
+          { time: '2025-01-03', open: 110, high: 120, low: 100, close: 115 },
+        ]
+        series.setData(data)
+        console.log('Data set')
+        setStatus('Chart ready!')
+        
+      } catch (err) {
+        console.error('Chart init error:', err)
+        const errorMsg = err instanceof Error ? err.message : String(err)
+        setError(errorMsg)
+        setStatus(`Error: ${errorMsg}`)
+      }
+    }
+
+    initChart()
+  }, [])
+
+  return (
+    <div className="min-h-screen bg-gray-900 p-8">
+      <h1 className="text-white text-2xl mb-4">Minimal Chart Test</h1>
+      <div className="text-gray-300 mb-4">Status: {status}</div>
+      {error && (
+        <div className="text-red-400 mb-4 p-4 bg-red-900/20 rounded">
+          Error: {error}
+        </div>
+      )}
+      <div 
+        ref={chartContainerRef} 
+        className="bg-gray-800 border border-gray-600"
+        style={{ width: '800px', height: '400px' }}
+      />
+    </div>
+  )
+}