feat: paginate and search brand questions across selects

Make GET /api/tenant/brands/:id/questions return a paginated
QuestionListResponse (items/total/page/page_size) with optional `q`
full-text filter, validated page/page_size query params, and per-params
cache keys. Add a usePaginatedBrandQuestions composable backing the
imitation, template-wizard, and tracking question selects with
search-as-you-type and infinite scroll, plus ensure-loaded-by-id so a
deep-linked or pre-selected question is fetched even when off the first
page. Brands view now drives its questions table via server pagination.

Also redesign the Tracking hot-questions and cited-articles lists
(mention-rate badges/bars, metric groups, refreshed styling) and fall
back to citation-fact article_id/title when no high-confidence URL alias
matches, so cited articles surface even without an alias row.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/admin-web/src/lib/api.ts

@@ -124,6 +124,7 @@ import type {
   QuestionCombinationFillResult,
   QuestionCombinationRequest,
   QuestionDistillRequest,
+  QuestionListResponse,
   QuestionRequest,
   QuotaSummary,
   RecentArticle,
@@ -1139,9 +1140,12 @@ export const brandsApi = {
   removeKeyword(brandId: number, keywordId: number) {
     return apiClient.remove<null>(`/api/tenant/brands/${brandId}/keywords/${keywordId}`)
   },
-  listQuestions(brandId: number, keywordId?: number | null) {
-    return apiClient.get<Question[]>(`/api/tenant/brands/${brandId}/questions`, {
-      params: keywordId ? { keyword_id: keywordId } : undefined,
+  listQuestions(
+    brandId: number,
+    params?: { keyword_id?: number | null; page?: number; page_size?: number; q?: string },
+  ) {
+    return apiClient.get<QuestionListResponse>(`/api/tenant/brands/${brandId}/questions`, {
+      params,
     })
   },
   previewQuestionCombination(brandId: number, payload: QuestionCombinationRequest) {