Fix: Critical Position Manager monitoring issues

**Root Cause:** Position Manager didn't detect when on-chain TP/SL orders closed positions externally, causing endless error loops and stale position data.

**Issues Fixed:**
1. Position Manager now checks if on-chain position still exists before attempting to close
2. Detects external closures (by on-chain orders) and updates database accordingly
3. Determines likely exit reason based on price vs TP/SL levels
4. Automatically cancels leftover orders when position detected as closed
5. Analytics now properly shows stopped-out trades

**Technical Changes:**
- Added position existence check at start of checkTradeConditions()
- Calls DriftService.getPosition() to verify on-chain state
- Updates database with exitPrice, exitReason, realizedPnL when external closure detected
- Removes trade from monitoring after external closure
- Handles size mismatches for partial closes (TP1 hit externally)

**Database Fix:**
- Manually closed orphaned trade (stopped out 9 hours ago but still marked 'open')
- Calculated and set realizedPnL = -$12.00 for stopped-out SHORT position
- Analytics now shows 3 total trades instead of missing the SL exit

**Testing:**
- Bot starts cleanly with no error loops
- Position monitoring active with 0 trades (as expected)
- Analytics correctly shows stopped-out trade in statistics

.env

@@ -61,7 +61,7 @@ PYTH_HERMES_URL=https://hermes.pyth.network
 # Position sizing
 # Base position size in USD (default: 50 for safe testing)
 # Example: 50 with 10x leverage = $500 notional position
-MAX_POSITION_SIZE_USD=80
+MAX_POSITION_SIZE_USD=78
 
 # Leverage multiplier (1-20, default: 10)
 # Higher leverage = bigger gains AND bigger losses
@@ -70,7 +70,7 @@ LEVERAGE=10
 # Risk parameters (as percentages)
 # Stop Loss: Close 100% of position when price drops this much
 # Example: -1.5% on 10x = -15% account loss
-STOP_LOSS_PERCENT=-1.5
+STOP_LOSS_PERCENT=-1.1
 
 # ================================
 # DUAL STOP SYSTEM (Advanced)
@@ -93,7 +93,7 @@ HARD_STOP_PERCENT=-2.5
 
 # Take Profit 1: Close 50% of position at this profit level
 # Example: +0.7% on 10x = +7% account gain
-TAKE_PROFIT_1_PERCENT=0.7
+TAKE_PROFIT_1_PERCENT=0.4
 
 # Take Profit 1 Size: What % of position to close at TP1
 # Example: 50 = close 50% of position
@@ -101,7 +101,7 @@ TAKE_PROFIT_1_SIZE_PERCENT=75
 
 # Take Profit 2: Close remaining 50% at this profit level
 # Example: +1.5% on 10x = +15% account gain
-TAKE_PROFIT_2_PERCENT=1.1
+TAKE_PROFIT_2_PERCENT=0.7
 
 # Take Profit 2 Size: What % of remaining position to close at TP2
 # Example: 100 = close all remaining position