Fix daily target dropping below minDayPnL after min days met

Math.max(baseAmount, effectiveMinDay) ensures the floor is always
enforced when minDayPnL > 0, not just inside the min-day reservation block.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/trading-logic.ts

@@ -146,5 +146,5 @@ export function computeDailyTarget(
         baseAmount = Math.max(0, profitTarget - totalProfit);
     }
 
-    return { amount: Math.round(baseAmount * 100) / 100, path };
+    return { amount: Math.round(Math.max(baseAmount, effectiveMinDay) * 100) / 100, path };
 }