Fall back to base minTradingDays when stage doesn't specify one

When a withdrawal stage has minTradingDays unset (0 or missing), use
the account's base minTradingDays instead of overriding to 0. This
was causing min-day reservation to skip and return consistency-based
targets instead of the min-day floor.

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

lib/trading-logic.ts

@@ -33,7 +33,8 @@ export function resolveEffectiveConfig(
         }
         const idx = Math.min(withdrawalCount - 1, withdrawalStages.length - 1);
         const stage = withdrawalStages[idx];
-        return { profitTarget: stage.profit, consistency: stage.consistency, minTradingDays: stage.minTradingDays };
+        // Fall back to base minTradingDays when the stage doesn't specify one (0 or missing)
+        return { profitTarget: stage.profit, consistency: stage.consistency, minTradingDays: stage.minTradingDays || minTradingDays };
     }
     return { profitTarget, consistency, minTradingDays };
 }