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.

server/internal/tenant/app/cache_support.go

@@ -75,6 +75,10 @@ func brandListCacheKey(tenantID int64) string {
 	return fmt.Sprintf("brand:list:%d", tenantID)
 }
 
+func brandLibrarySummaryCacheKey(tenantID int64) string {
+	return fmt.Sprintf("brand:library_summary:%d", tenantID)
+}
+
 func brandDetailCacheKey(tenantID, brandID int64) string {
 	return fmt.Sprintf("brand:detail:%d:%d", tenantID, brandID)
 }
@@ -121,6 +125,7 @@ func invalidateBrandCaches(ctx context.Context, c sharedcache.Cache, tenantID, b
 	deleteCachePrefix(ctx, c, brandQuestionsCachePrefix(tenantID, brandID))
 	deleteCachePrefix(ctx, c, brandCompetitorsCachePrefix(tenantID, brandID))
 	deleteCacheKey(ctx, c, brandListCacheKey(tenantID))
+	deleteCacheKey(ctx, c, brandLibrarySummaryCacheKey(tenantID))
 	deleteCachePrefix(ctx, c, scheduleTaskListCachePrefix(tenantID))
 	deleteCachePrefix(ctx, c, scheduleTaskDetailCachePrefix(tenantID))
 	invalidateWorkspaceCaches(ctx, c, tenantID)