feat: PubMed搜索合规审计 Phase 5-7 全部修复

P1-2: [SB][STAT][UID][DEP][MESH]字段支持
P1-4: [MH:noexp]解析+抑制树展开
P3: 前端date_to/P3-1、CJK高亮/P3-3、extractPlainText/P3-4、precision_mode移除/P3-6、loadMore sort/P3-5
P4-1: 词数上限50→100
P4-2: retracted参数清理

frontend/src/components/literature/LiteratureCard.vue

@@ -111,8 +111,11 @@ const nctId = computed(() => {
 // 从查询中提取纯文本词（去掉 PubMed 字段标签如 [TI]、[AB] 等）
 function extractPlainText(q: string): string {
   return q
-    .replace(/\[[\w-]+\]/g, '')
-    .replace(/"?\b(AND|OR|NOT)\b"?/gi, '')
+    .replace(/\[[\w-]+\]/g, '')           // [field tags]
+    .replace(/"?\b(AND|OR|NOT)\b"?/gi, '')// boolean operators
+    .replace(/[()]/g, '')                 // P3-4: 去掉括号
+    .replace(/#\d+/g, '')                 // P3-4: 去掉 #N 引用标记
+    .replace(/\*/g, '')                   // P3-4: 去掉通配符
     .replace(/"/g, '')
     .replace(/\s+/g, ' ')
     .trim()
@@ -127,8 +130,9 @@ const highlightedTitle = computed(() => {
   const terms = plain.split(/\s+/).filter(t => t.length > 0)
   if (terms.length === 0) return ''
   const escaped = terms.map(t => t.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'))
-  // 单字符词添加 \b 词边界避免过匹配（"A" 不匹配每个字母 "a"）
-  const pattern = escaped.map(e => e.length === 1 ? `\\b${e}\\b` : e).join('|')
+  // P3-3: 单字符词添加 \b 词边界，但 CJK 字符跳过（\b 对 CJK 无效）
+  const isCJK = (c: string) => /[一-鿿㐀-䶿豈-﫿]/.test(c)
+  const pattern = escaped.map(e => e.length === 1 && !isCJK(e) ? `\\b${e}\\b` : e).join('|')
   const parts = title.split(new RegExp(`(${pattern})`, 'gi'))
   return parts.map((part: string) =>
     terms.some(t => part.toLowerCase() === t.toLowerCase())

frontend/src/views/app/SearchView.vue

@@ -277,7 +277,7 @@ const { page, total, goToPage } = usePagination({
         query: query.value, page: p, page_size: pageSize.value, sort: sort.value,
       }
       if (field.value !== 'all') body.field = field.value
-      if (precisionMode.value !== 'majr') body.precision_mode = precisionMode.value
+      // P3-6: precision_mode 不再发送（后端已忽略）
       // ── Keyset 游标分页（sort=date 时跳过 COUNT，纯翻页模式） ──
       const useKeyset = sort.value === 'date'
       if (useKeyset) {
@@ -371,10 +371,11 @@ function restoreFromQuery() {
     datePreset.value = String(route.query.date_preset)
   } else if (route.query.date_from) {
     datePreset.value = null
-    // 尝试解析 date_from/date_to 到 yearFromStr/yearToStr
     const df = String(route.query.date_from)
     if (df.length >= 4) yearFromStr.value = df.slice(0, 4)
-  } else if (route.query.date_to) {
+  }
+  if (route.query.date_to) {
+    datePreset.value = null
     const dt = String(route.query.date_to)
     if (dt.length >= 4) yearToStr.value = dt.slice(0, 4)
   }

frontend/src/views/public/HomeView.vue

@@ -214,7 +214,7 @@ function doLocalSearch() {
   if (searchParams.value.date_from) query.date_from = searchParams.value.date_from
   if (searchParams.value.date_to) query.date_to = searchParams.value.date_to
   if (searchParams.value.sort && searchParams.value.sort !== 'date') query.sort = searchParams.value.sort
-  if (searchParams.value.precision_mode && searchParams.value.precision_mode !== 'majr') query.precision = searchParams.value.precision_mode
+  // P3-6: precision_mode 不再发送
   if (searchParams.value.retracted) query.retracted = searchParams.value.retracted
   if (searchParams.value.negative_result) query.negative = searchParams.value.negative_result
   if (selectedTagIds.value.length > 0) query.tag = selectedTagIds.value.join(',')
@@ -319,7 +319,7 @@ async function loadMore() {
   if (loadingMore.value || !hasMore.value) return
   loadingMore.value = true
   try {
-    const body: Record<string, any> = { page_size: searchParams.value.page_size, sort: 'date' }
+    const body: Record<string, any> = { page_size: searchParams.value.page_size, sort: searchParams.value.sort || 'date' }
     if (searchParams.value.query) body.query = searchParams.value.query
     if (searchParams.value.field !== 'all') body.field = searchParams.value.field
     if (searchParams.value.tag_ids.length) body.tag_ids = searchParams.value.tag_ids
@@ -327,7 +327,7 @@ async function loadMore() {
     if (searchParams.value.date_to) body.date_to = searchParams.value.date_to
     if (searchParams.value.retracted) body.retracted = searchParams.value.retracted
     if (searchParams.value.negative_result) body.negative_result = searchParams.value.negative_result
-    if (searchParams.value.precision_mode) body.precision_mode = searchParams.value.precision_mode
+    // P3-6: precision_mode 不再发送
     if (cursorDate.value && cursorId.value) {
       body.cursor_date = cursorDate.value
       body.cursor_id = cursorId.value