Fix Drift balance calculation and implement multi-RPC failover system

- Fixed balance calculation: corrected precision factor for Drift scaledBalance (5.69 vs wrong 0,678.76)
- Implemented multi-RPC failover system with 4 endpoints (Helius, Solana official, Alchemy, Ankr)
- Updated automation page with balance sync, leverage-based position sizing, and removed daily trade limits
- Added RPC status monitoring endpoint
- Updated balance and positions APIs to use failover system
- All Drift APIs now working correctly with accurate balance data

app/api/rpc-status/route.js

@@ -0,0 +1,16 @@
+import { NextResponse } from 'next/server'
+import { getRpcStatus } from '../../../lib/rpc-failover.js'
+
+export async function GET() {
+  try {
+    const status = getRpcStatus()
+    return NextResponse.json(status)
+  } catch (error) {
+    console.error('❌ RPC Status error:', error)
+    return NextResponse.json({
+      success: false,
+      error: 'Failed to get RPC status',
+      details: error.message
+    }, { status: 500 })
+  }
+}