critical: Fix EMERGENCY_STOP_PERCENT env var not being loaded (Bug #90)

- Added emergencyStopPercent to getConfigFromEnv() function
- Previously hardcoded -2% was always used instead of .env value
- Root cause of trade cmkf5a2ld00kmqn07hvj351fe closing at -2.03%
  when SL was set at -2.8%
- Entry: $145.05, Exit: $142.11, SL: $140.99
- Emergency stop at -2% = $142.15 triggered, ignoring .env -20% setting

Financial Impact: Trade closed prematurely, missing potential recovery

config/trading.ts

@@ -636,6 +636,9 @@ export function getConfigFromEnv(): Partial<TradingConfig> {
     stopLossPercent: process.env.STOP_LOSS_PERCENT 
       ? parseFloat(process.env.STOP_LOSS_PERCENT) 
       : undefined,
+    emergencyStopPercent: process.env.EMERGENCY_STOP_PERCENT
+      ? parseFloat(process.env.EMERGENCY_STOP_PERCENT)
+      : undefined,
     useDualStops: process.env.USE_DUAL_STOPS 
       ? process.env.USE_DUAL_STOPS === 'true'
       : undefined,