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

components/TradingHistory.tsx

@@ -19,44 +19,26 @@ export default function TradingHistory() {
   useEffect(() => {
     async function fetchTrades() {
       try {
-        const res = await fetch('/api/trading-history')
-        if (res.ok) {
-          const data = await res.json()
-          setTrades(data)
+        // Try Drift trading history first
+        const driftRes = await fetch('/api/drift/trading-history')
+        if (driftRes.ok) {
+          const data = await driftRes.json()
+          if (data.success && data.trades) {
+            setTrades(data.trades)
+          } else {
+            // No trades available
+            setTrades([])
+          }
         } else {
-          // Mock data for demonstration
-          setTrades([
-            {
-              id: '1',
-              symbol: 'BTCUSD',
-              side: 'BUY',
-              amount: 0.1,
-              price: 45230.50,
-              status: 'FILLED',
-              executedAt: new Date().toISOString(),
-              pnl: 125.50
-            },
-            {
-              id: '2',
-              symbol: 'ETHUSD',
-              side: 'SELL',
-              amount: 2.5,
-              price: 2856.75,
-              status: 'FILLED',
-              executedAt: new Date(Date.now() - 3600000).toISOString(),
-              pnl: -67.25
-            },
-            {
-              id: '3',
-              symbol: 'SOLUSD',
-              side: 'BUY',
-              amount: 10,
-              price: 95.80,
-              status: 'FILLED',
-              executedAt: new Date(Date.now() - 7200000).toISOString(),
-              pnl: 89.75
-            }
-          ])
+          // API failed - try fallback to local database
+          const res = await fetch('/api/trading-history')
+          if (res.ok) {
+            const data = await res.json()
+            setTrades(data || [])
+          } else {
+            // Both APIs failed - show empty state
+            setTrades([])
+          }
         }
       } catch (error) {
         console.error('Failed to fetch trades:', error)