Fix spot trade logic: remove incorrect positions and enhance trade history display

- Remove incorrect open positions for spot swaps (instant settlements)
- Add DELETE API route for position removal (/api/trading/positions/[positionId])
- Update existing SOL/USDC trade to clearly mark as SPOT_SWAP
- Enhance TradesHistoryPanel with visual trade type indicators:
  * SPOT_SWAP: Purple badge with ⚡ icon
  * MARKET: Blue badge with 📈 icon
  * LIMIT: Orange badge with 🎯 icon
  * STOP: Red badge with 🛑 icon
- Add trade history update functionality for modifying existing trades
- Fix container communication URLs in execute-dex route

Result: Spot trades no longer create open positions, trade history clearly shows trade types

app/api/trading/positions/[positionId]/route.js

@@ -0,0 +1,72 @@
+import { NextResponse } from 'next/server'
+import fs from 'fs'
+import path from 'path'
+
+// Persistent storage for positions using JSON file
+const POSITIONS_FILE = path.join(process.cwd(), 'data', 'positions.json')
+
+// Helper functions for persistent storage
+function loadPositions() {
+  try {
+    if (fs.existsSync(POSITIONS_FILE)) {
+      const data = fs.readFileSync(POSITIONS_FILE, 'utf8')
+      return JSON.parse(data)
+    }
+  } catch (error) {
+    console.error('Error loading positions:', error)
+  }
+  return []
+}
+
+function savePositions(positions) {
+  try {
+    fs.writeFileSync(POSITIONS_FILE, JSON.stringify(positions, null, 2))
+  } catch (error) {
+    console.error('Error saving positions:', error)
+  }
+}
+
+export async function DELETE(request, { params }) {
+  try {
+    const { positionId } = params
+
+    if (!positionId) {
+      return NextResponse.json({
+        success: false,
+        error: 'Position ID is required'
+      }, { status: 400 })
+    }
+
+    // Load existing positions
+    const activePositions = loadPositions()
+    
+    // Find and remove the position
+    const positionIndex = activePositions.findIndex(pos => pos.id === positionId)
+    
+    if (positionIndex === -1) {
+      return NextResponse.json({
+        success: false,
+        error: 'Position not found'
+      }, { status: 404 })
+    }
+
+    const removedPosition = activePositions[positionIndex]
+    activePositions.splice(positionIndex, 1)
+    savePositions(activePositions)
+
+    console.log(`🗑️  Removed incorrect position: ${removedPosition.symbol} (${positionId})`)
+
+    return NextResponse.json({
+      success: true,
+      message: `Position ${positionId} removed successfully`,
+      removedPosition
+    })
+
+  } catch (error) {
+    console.error('Error deleting position:', error)
+    return NextResponse.json({
+      success: false,
+      error: 'Failed to delete position'
+    }, { status: 500 })
+  }
+}