fix: Use TRIGGER_LIMIT for stop loss orders

- Changed from LIMIT to TRIGGER_LIMIT for proper stop loss display
- SL now shows correctly on Drift UI with trigger line
- Added 0.5% buffer on limit price below trigger for safety
- Widened default SL to -2% for safer testing
- Tested and verified all 3 exit orders (TP1, TP2, SL) working

.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=10
+MAX_POSITION_SIZE_USD=20
 
 # Leverage multiplier (1-20, default: 10)
 # Higher leverage = bigger gains AND bigger losses
@@ -70,7 +70,7 @@ LEVERAGE=5
 # 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=-0.9
+STOP_LOSS_PERCENT=-2.0
 
 # Take Profit 1: Close 50% of position at this profit level
 # Example: +0.7% on 10x = +7% account gain