fix(brand-questions): accept generic search terms in lexicon validation

Search terms like "全屋定制" or "GEO排名优化" were rejected as invalid because
both the Vue candidate validator and the Go question_metadata classifier
required interrogative cues (什么/如何/为什么/...). Lexicon entries are search
terms, not questions, so require only letters or digits plus the existing
4-char minimum. Rename helpers to searchTermLooksValid/questionLooksValid
to reflect the looser semantics, and relabel the navigation entry from
"公司和词库" to "品牌和词库" to match the actual domain.

apps/admin-web/src/views/BrandQuestionCreateView.vue

@@ -506,12 +506,12 @@ function normalizeSearchTermText(value: string): string {
     .replace(/\s+/g, '')
 }
 
-function questionLooksLikeQuestion(value: string): boolean {
+function searchTermLooksValid(value: string): boolean {
   const text = normalizeSearchTermText(value)
   if (text.length < 4) {
     return false
   }
-  return /什么|如何|怎么|哪|为什么|是否|能不能|适合|区别|对比|推荐/.test(text)
+  return /[\p{L}\p{N}]/u.test(text)
 }
 
 function toCandidateRows(candidates: QuestionCandidate[]): CandidateRow[] {
@@ -519,7 +519,7 @@ function toCandidateRows(candidates: QuestionCandidate[]): CandidateRow[] {
     .map((candidate, index) => {
       const text = normalizeSearchTermText(candidate.text)
       const tooShort = text.length < 4
-      const invalid = !questionLooksLikeQuestion(text)
+      const invalid = !searchTermLooksValid(text)
       return {
         ...candidate,
         text,
@@ -545,7 +545,7 @@ function buildLocalCandidates(texts: string[], source: QuestionSource): Candidat
     seen.add(key)
     const tooShort = text.length < 4
     const duplicate = existingQuestionSet.value.has(key) || duplicateInBatch
-    const invalid = !questionLooksLikeQuestion(text)
+    const invalid = !searchTermLooksValid(text)
     rows.push({
       id: `${Date.now()}-${rows.length}-${text}`,
       text,
@@ -682,7 +682,7 @@ function refreshCandidate(row: CandidateRow): void {
   )
   row.too_short = row.text.length < 4
   row.duplicate = Boolean(key) && (existingQuestionSet.value.has(key) || duplicateInBatch)
-  row.suggest_skip = row.too_short || row.duplicate || !questionLooksLikeQuestion(row.text)
+  row.suggest_skip = row.too_short || row.duplicate || !searchTermLooksValid(row.text)
 }
 
 function refreshAllCandidates(): void {