feat: add brand library management features

- Introduced BrandLibrarySummary type to encapsulate brand library limits and usage.
- Updated Brand interface to include keyword_count and question_count fields.
- Implemented brand library limits in the backend, including max brands, keywords, and questions per keyword.
- Added API endpoint to retrieve brand library summary.
- Enhanced BrandsView.vue to display brand library usage and limits.
- Implemented computed properties to manage brand, keyword, and question limits in the UI.
- Updated mutation handlers to invalidate relevant queries upon creating/updating brands, keywords, and questions.
- Added visual indicators for brand, keyword, and question limits in the UI.
- Enhanced error handling for exceeding brand and keyword limits during creation.

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

@@ -9,6 +9,7 @@ import type {
   ArticleVersion,
   AuthTokens,
   Brand,
+  BrandLibrarySummary,
   BrandRequest,
   Competitor,
   CompetitorRequest,
@@ -540,6 +541,9 @@ export const brandsApi = {
   list() {
     return apiClient.get<Brand[]>("/api/tenant/brands");
   },
+  getLibrarySummary() {
+    return apiClient.get<BrandLibrarySummary>("/api/tenant/brands/library-summary");
+  },
   create(payload: BrandRequest) {
     return apiClient.post<Brand, BrandRequest>("/api/tenant/brands", payload);
   },