区间打分根据用户选择日期自动判断主力合约，放宽前端日期限制支持历史区间

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/frontend/src/views/RunView.vue

@@ -67,10 +67,9 @@ function toDate(s: string) {
 
 function isDateAllowed(d: Date): boolean {
   if (!active.value) return true
-  const min = toDate(active.value.min_date).getTime()
   const max = toDate(active.value.max_date).getTime()
   const t = d.getTime()
-  return t >= min && t <= max
+  return t <= max
 }
 
 function disabledDate(d: Date) {