feat: Complete Trading Bot v4 with Drift Protocol integration

Features:
- Autonomous trading system with Drift Protocol on Solana
- Real-time position monitoring with Pyth price feeds
- Dynamic stop-loss and take-profit management
- n8n workflow integration for TradingView signals
- Beautiful web UI for settings management
- REST API for trade execution and monitoring

- Next.js 15 with standalone output mode
- TypeScript with strict typing
- Docker containerization with multi-stage builds
- PostgreSQL database for trade history
- Singleton pattern for Drift client connection pooling
- BN.js for BigNumber handling (Drift SDK requirement)

- Configurable stop-loss and take-profit levels
- Breakeven trigger and profit locking
- Daily loss limits and trade cooldowns
- Slippage tolerance controls
- DRY_RUN mode for safe testing

- Real-time risk calculator
- Interactive sliders for all parameters
- Live preview of trade outcomes
- Position sizing and leverage controls
- Beautiful gradient design with Tailwind CSS

- POST /api/trading/execute - Execute trades
- POST /api/trading/close - Close positions
- GET /api/trading/positions - Monitor active trades
- GET /api/trading/check-risk - Validate trade signals
- GET /api/settings - View configuration
- POST /api/settings - Update configuration

- Fixed Borsh serialization errors (simplified order params)
- Resolved RPC rate limiting with singleton pattern
- Fixed BigInt vs BN type mismatches
- Corrected order execution flow
- Improved position state management

- Complete setup guides
- Docker deployment instructions
- n8n workflow configuration
- API reference documentation
- Risk management guidelines

- Runs on port 3001 (external), 3000 (internal)
- Uses Helius RPC for optimal performance
- Production-ready with error handling
- Health monitoring and logging

app/api/trading/close/route.ts

@@ -0,0 +1,93 @@
+/**
+ * Close Position API Endpoint
+ * 
+ * Closes an existing position (partially or fully)
+ */
+
+import { NextRequest, NextResponse } from 'next/server'
+import { closePosition } from '@/lib/drift/orders'
+import { initializeDriftService } from '@/lib/drift/client'
+
+export const dynamic = 'force-dynamic'
+export const runtime = 'nodejs'
+
+interface CloseRequest {
+  symbol: string // e.g., 'SOL-PERP'
+  percentToClose?: number // 0-100, default 100 (close entire position)
+}
+
+export async function POST(request: NextRequest) {
+  try {
+    // Verify authorization
+    const authHeader = request.headers.get('authorization')
+    const expectedAuth = `Bearer ${process.env.API_SECRET_KEY}`
+    
+    if (!authHeader || authHeader !== expectedAuth) {
+      return NextResponse.json(
+        { success: false, error: 'Unauthorized' },
+        { status: 401 }
+      )
+    }
+
+    const body: CloseRequest = await request.json()
+    const { symbol, percentToClose = 100 } = body
+
+    if (!symbol) {
+      return NextResponse.json(
+        { success: false, error: 'Missing symbol' },
+        { status: 400 }
+      )
+    }
+
+    if (percentToClose < 0 || percentToClose > 100) {
+      return NextResponse.json(
+        { success: false, error: 'percentToClose must be between 0 and 100' },
+        { status: 400 }
+      )
+    }
+
+    console.log(`📊 Closing position: ${symbol} (${percentToClose}%)`)
+
+    // Initialize Drift service if not already initialized
+    await initializeDriftService()
+
+    // Close position
+    const result = await closePosition({
+      symbol,
+      percentToClose,
+      slippageTolerance: 1.0,
+    })
+
+    if (!result.success) {
+      return NextResponse.json(
+        {
+          success: false,
+          error: 'Position close failed',
+          message: result.error,
+        },
+        { status: 500 }
+      )
+    }
+
+    return NextResponse.json({
+      success: true,
+      transactionSignature: result.transactionSignature,
+      symbol,
+      closePrice: result.closePrice,
+      closedSize: result.closedSize,
+      realizedPnL: result.realizedPnL,
+      percentClosed: percentToClose,
+    })
+
+  } catch (error) {
+    console.error('❌ Close position error:', error)
+    return NextResponse.json(
+      {
+        success: false,
+        error: 'Internal server error',
+        message: error instanceof Error ? error.message : 'Unknown error',
+      },
+      { status: 500 }
+    )
+  }
+}