fix: 第22轮搜索审计修复 — De Morgan语义/部分日期/has_not/custom URL等8项

Bug-R22-1 (MEDIUM): OR模式特殊字段NOT产生错误De Morgan语义 — 17处修正
Bug-R22-2 (MEDIUM): has_not不反映日期范围NOT — 添加_date_range_markers检查
Bug-R22-3 (MEDIUM): YYYY-MM[DP]未引号部分日期无法解析 — 预处理器标准化
Bug-R22-4 (MEDIUM): date_preset=custom URL恢复丢失年份范围 — 读取URL参数
Bug-R22-5 (MEDIUM): 错误状态下分页总数残留 — 搜索开始时重置total
Bug-R22-6 (LOW): 搜索错误状态未在开始时清除 — 搜索开始时重置searchError
Bug-R22-7 (LOW): DATE token不在未消耗标记恢复处理器中 — 添加DATE类型
Bug-R22-8 (LOW): 外部NOT组内is_not被忽略 — 保留t.is_not

frontend/src/views/app/SearchView.vue

@@ -274,6 +274,8 @@ const { page, total, goToPage } = usePagination({
     const gen = ++searchGeneration.value
     loading.value = true
     searched.value = true
+    searchError.value = ''
+    total.value = 0
     try {
       if (p === 1 && query.value.trim()) {
         trackAction('search', 'search', query.value.trim(), { sort: sort.value })
@@ -392,8 +394,13 @@ function restoreFromQuery() {
   if (route.query.sort && VALID_SORTS.has(String(route.query.sort))) sort.value = String(route.query.sort)
   if (route.query.date_preset && ['1y','5y','10y','custom'].includes(String(route.query.date_preset))) {
     datePreset.value = String(route.query.date_preset)
-    yearFromStr.value = ''
-    yearToStr.value = ''
+    if (datePreset.value === 'custom') {
+      if (route.query.year_from) yearFromStr.value = String(route.query.year_from)
+      if (route.query.year_to) yearToStr.value = String(route.query.year_to)
+    } else {
+      yearFromStr.value = ''
+      yearToStr.value = ''
+    }
   } else if (route.query.date_from || route.query.date_to) {
     datePreset.value = null
     if (route.query.date_from) {