Fix: Save MAE/MFE values when trades exit

Bug: MAE/MFE was tracked in memory during trades but not saved to database on exit
Cause: updateTradeExit() wasn't receiving or saving MAE/MFE parameters

Changes:
- Added MAE/MFE fields to UpdateTradeExitParams interface
- Modified updateTradeExit() to save maxFavorableExcursion, maxAdverseExcursion, maxFavorablePrice, maxAdversePrice
- Updated both updateTradeExit() calls in Position Manager to pass MAE/MFE values
- Enhanced exit logging to show final MAE/MFE percentages

Impact: Future trades will now properly save MAE/MFE data for analytics
Note: Past 2 trades (from before this fix) don't have MAE/MFE saved

lib/trading/position-manager.ts

@@ -348,8 +348,13 @@ export class PositionManager {
             holdTimeSeconds,
             maxDrawdown: 0,
             maxGain: trade.peakPnL,
+            // Save final MAE/MFE values
+            maxFavorableExcursion: trade.maxFavorableExcursion,
+            maxAdverseExcursion: trade.maxAdverseExcursion,
+            maxFavorablePrice: trade.maxFavorablePrice,
+            maxAdversePrice: trade.maxAdversePrice,
           })
-          console.log(`💾 External closure recorded: ${exitReason} at $${currentPrice} | P&L: $${realizedPnL.toFixed(2)}`)
+          console.log(`💾 External closure recorded: ${exitReason} at $${currentPrice} | P&L: $${realizedPnL.toFixed(2)} | MFE: ${trade.maxFavorableExcursion.toFixed(2)}% | MAE: ${trade.maxAdverseExcursion.toFixed(2)}%`)
         } catch (dbError) {
           console.error('❌ Failed to save external closure:', dbError)
         }
@@ -616,8 +621,13 @@ export class PositionManager {
               holdTimeSeconds,
               maxDrawdown: 0, // TODO: Track this
               maxGain: trade.peakPnL,
+              // Save final MAE/MFE values
+              maxFavorableExcursion: trade.maxFavorableExcursion,
+              maxAdverseExcursion: trade.maxAdverseExcursion,
+              maxFavorablePrice: trade.maxFavorablePrice,
+              maxAdversePrice: trade.maxAdversePrice,
             })
-            console.log('💾 Trade saved to database')
+            console.log('💾 Trade saved to database with MAE: ' + trade.maxAdverseExcursion.toFixed(2) + '% | MFE: ' + trade.maxFavorableExcursion.toFixed(2) + '%')
           } catch (dbError) {
             console.error('❌ Failed to save trade exit to database:', dbError)
             // Don't fail the close if database fails