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/transport/brand_handler.go

@@ -15,7 +15,7 @@ type BrandHandler struct {
 }
 
 func NewBrandHandler(a *bootstrap.App) *BrandHandler {
-	return &BrandHandler{svc: app.NewBrandService(a.DB, a.MonitoringDB, a.AuditLogs).WithCache(a.Cache)}
+	return &BrandHandler{svc: app.NewBrandService(a.DB, a.MonitoringDB, a.AuditLogs, a.Config.BrandLibrary).WithCache(a.Cache)}
 }
 
 func (h *BrandHandler) List(c *gin.Context) {
@@ -27,6 +27,15 @@ func (h *BrandHandler) List(c *gin.Context) {
 	response.Success(c, data)
 }
 
+func (h *BrandHandler) Summary(c *gin.Context) {
+	data, err := h.svc.Summary(c.Request.Context())
+	if err != nil {
+		response.Error(c, err)
+		return
+	}
+	response.Success(c, data)
+}
+
 func (h *BrandHandler) Create(c *gin.Context) {
 	var req app.BrandRequest
 	if err := c.ShouldBindJSON(&req); err != nil {

server/internal/tenant/transport/router.go

@@ -80,6 +80,7 @@ func RegisterRoutes(app *bootstrap.App) {
 	brands := protected.Group("/tenant/brands")
 	brandHandler := NewBrandHandler(app)
 	brands.GET("", brandHandler.List)
+	brands.GET("/library-summary", brandHandler.Summary)
 	brands.POST("", brandHandler.Create)
 	brands.GET("/:id", brandHandler.Detail)
 	brands.PUT("/:id", brandHandler.Update)

server/internal/tenant/transport/router_test.go

@@ -29,6 +29,7 @@ func TestProtectedRoutes_RequireAuth(t *testing.T) {
 		{http.MethodGet, "/api/tenant/templates"},
 		{http.MethodGet, "/api/tenant/articles"},
 		{http.MethodGet, "/api/tenant/brands"},
+		{http.MethodGet, "/api/tenant/brands/library-summary"},
 		{http.MethodGet, "/api/tenant/monitoring/brands/:brand_id/questions/:question_id/detail"},
 		{http.MethodPost, "/api/tenant/brands"},
 	}