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
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