feat: Add direction-specific quality thresholds and dynamic collateral display

- Split QUALITY_LEVERAGE_THRESHOLD into separate LONG and SHORT variants
- Added /api/drift/account-health endpoint for real-time collateral data
- Updated settings UI to show separate controls for LONG/SHORT thresholds
- Position size calculations now use dynamic collateral from Drift account
- Updated .env and docker-compose.yml with new environment variables
- LONG threshold: 95, SHORT threshold: 90 (configurable independently)

Files changed:
- app/api/drift/account-health/route.ts (NEW) - Account health API endpoint
- app/settings/page.tsx - Added collateral state, separate threshold inputs
- app/api/settings/route.ts - GET/POST handlers for LONG/SHORT thresholds
- .env - Added QUALITY_LEVERAGE_THRESHOLD_LONG/SHORT variables
- docker-compose.yml - Added new env vars with fallback defaults

Impact:
- Users can now configure quality thresholds independently for LONG vs SHORT signals
- Position size display dynamically updates based on actual Drift account collateral
- More flexible risk management with direction-specific leverage tiers

docker-compose.yml

@@ -49,7 +49,9 @@ services:
       USE_ADAPTIVE_LEVERAGE: ${USE_ADAPTIVE_LEVERAGE:-true}
       HIGH_QUALITY_LEVERAGE: ${HIGH_QUALITY_LEVERAGE:-5}
       LOW_QUALITY_LEVERAGE: ${LOW_QUALITY_LEVERAGE:-1}
-      QUALITY_LEVERAGE_THRESHOLD: ${QUALITY_LEVERAGE_THRESHOLD:-95}
+      QUALITY_LEVERAGE_THRESHOLD_LONG: ${QUALITY_LEVERAGE_THRESHOLD_LONG:-95}
+      QUALITY_LEVERAGE_THRESHOLD_SHORT: ${QUALITY_LEVERAGE_THRESHOLD_SHORT:-90}
+      QUALITY_LEVERAGE_THRESHOLD: ${QUALITY_LEVERAGE_THRESHOLD:-95}  # Backward compatibility
       
       # Database (if using PostgreSQL)
       DATABASE_URL: ${DATABASE_URL:-postgresql://postgres:postgres@postgres:5432/trading_bot_v4}