feat: Add Telegram notifications for position closures

Implemented direct Telegram notifications when Position Manager closes positions:
- New helper: lib/notifications/telegram.ts with sendPositionClosedNotification()
- Integrated into Position Manager's executeExit() for all closure types
- Also sends notifications for ghost position cleanups

Notification includes:
- Symbol, direction, entry/exit prices
- P&L amount and percentage
- Position size and hold time
- Exit reason (TP1, TP2, SL, manual, ghost cleanup, etc.)
- MAE/MFE stats (max gain/drawdown during trade)

User request: Receive P&L notifications on position closures via Telegram bot
Previously: Only opening notifications via n8n workflow
Now: All closures (TP/SL/manual/ghost) send notifications directly

lib/trading/position-manager.ts

@@ -9,6 +9,7 @@ import { closePosition } from '../drift/orders'
 import { getPythPriceMonitor, PriceUpdate } from '../pyth/price-monitor'
 import { getMergedConfig, TradingConfig, getMarketConfig } from '../../config/trading'
 import { updateTradeExit, updateTradeState, getOpenTrades } from '../database/trades'
+import { sendPositionClosedNotification } from '../notifications/telegram'
 
 export interface ActiveTrade {
   id: string
@@ -328,6 +329,20 @@ export class PositionManager {
         maxAdversePrice: trade.maxAdversePrice,
       })
       console.log(`💾 Ghost closure saved to database`)
+      
+      // Send Telegram notification for ghost closure
+      await sendPositionClosedNotification({
+        symbol: trade.symbol,
+        direction: trade.direction,
+        entryPrice: trade.entryPrice,
+        exitPrice: trade.lastPrice,
+        positionSize: trade.currentSize,
+        realizedPnL: estimatedPnL,
+        exitReason: reason, // e.g., "Ghost position cleanup", "Layer 2: Ghost detected via Drift API"
+        holdTimeSeconds: Math.floor((Date.now() - trade.entryTime) / 1000),
+        maxDrawdown: Math.abs(Math.min(0, trade.maxAdverseExcursion)),
+        maxGain: Math.max(0, trade.maxFavorableExcursion),
+      })
     } catch (dbError) {
       console.error('❌ Failed to save ghost closure:', dbError)
     }
@@ -1214,6 +1229,20 @@ export class PositionManager {
         
         await this.removeTrade(trade.id)
         console.log(`✅ Position closed | P&L: $${trade.realizedPnL.toFixed(2)} | Reason: ${reason}`)
+        
+        // Send Telegram notification
+        await sendPositionClosedNotification({
+          symbol: trade.symbol,
+          direction: trade.direction,
+          entryPrice: trade.entryPrice,
+          exitPrice: result.closePrice || currentPrice,
+          positionSize: trade.positionSize,
+          realizedPnL: trade.realizedPnL,
+          exitReason: reason,
+          holdTimeSeconds: Math.floor((Date.now() - trade.entryTime) / 1000),
+          maxDrawdown: Math.abs(Math.min(0, trade.maxAdverseExcursion)),
+          maxGain: Math.max(0, trade.maxFavorableExcursion),
+        })
       } else {
         // Partial close (TP1)
         trade.realizedPnL += result.realizedPnL || 0