Remove demo data fallbacks - use only real Drift account data

- Updated Dashboard.tsx to remove demo data fallbacks
- Updated TradingHistory.tsx to use new Drift trading history endpoint
- Added getTradingHistory method to DriftTradingService
- Created new /api/drift/trading-history endpoint
- Removed fallback demo positions from getPositions method
- All UI components now show only real Drift account data or empty states
- No more hardcoded mock trades or positions

app/api/drift/trading-history/route.ts

@@ -0,0 +1,30 @@
+import { NextResponse } from 'next/server'
+import { driftTradingService } from '../../../../lib/drift-trading'
+
+export async function GET(request: Request) {
+  try {
+    const { searchParams } = new URL(request.url)
+    const limit = parseInt(searchParams.get('limit') || '50')
+    
+    console.log('📊 API: Getting Drift trading history...')
+    
+    const tradingHistory = await driftTradingService.getTradingHistory(limit)
+    
+    return NextResponse.json({
+      success: true,
+      trades: tradingHistory,
+      count: tradingHistory.length
+    })
+    
+  } catch (error: any) {
+    console.error('❌ API: Error getting trading history:', error)
+    return NextResponse.json(
+      { 
+        success: false, 
+        error: error.message,
+        trades: []
+      }, 
+      { status: 500 }
+    )
+  }
+}