feat: Position Manager persistence + order cleanup + improved stop loss

- Add Position Manager state persistence to survive restarts
  - Auto-restore open trades from database on startup
  - Save state after TP1, SL adjustments, profit locks
  - Persist to configSnapshot JSON field

- Add automatic order cancellation
  - Cancel all TP/SL orders when position fully closed
  - New cancelAllOrders() function in drift/orders.ts
  - Prevents orphaned orders after manual closes

- Improve stop loss management
  - Move SL to +0.35% after TP1 (was +0.15%)
  - Gives more breathing room for retracements
  - Still locks in half of TP1 profit

- Add database sync when Position Manager closes trades
  - Auto-update Trade record with exit data
  - Save P&L, exit reason, hold time
  - Fix analytics showing stale data

- Add trade state management functions
  - updateTradeState() for Position Manager persistence
  - getOpenTrades() for startup restoration
  - getInitializedPositionManager() for async init

- Create n8n database analytics workflows
  - Daily report workflow (automated at midnight)
  - Pattern analysis (hourly/daily performance)
  - Stop loss effectiveness analysis
  - Database analytics query workflow
  - Complete setup guide (N8N_DATABASE_SETUP.md)

app/api/trading/execute/route.ts

@@ -10,7 +10,7 @@ import { initializeDriftService } from '@/lib/drift/client'
 import { openPosition, placeExitOrders } from '@/lib/drift/orders'
 import { normalizeTradingViewSymbol } from '@/config/trading'
 import { getMergedConfig } from '@/config/trading'
-import { getPositionManager, ActiveTrade } from '@/lib/trading/position-manager'
+import { getInitializedPositionManager, ActiveTrade } from '@/lib/trading/position-manager'
 import { createTrade } from '@/lib/database/trades'
 
 export interface ExecuteTradeRequest {
@@ -209,7 +209,7 @@ export async function POST(request: NextRequest): Promise<NextResponse<ExecuteTr
     }
 
     // Add to position manager for monitoring
-    const positionManager = getPositionManager()
+    const positionManager = await getInitializedPositionManager()
     await positionManager.addTrade(activeTrade)
     
     console.log('✅ Trade added to position manager for monitoring')