feat(marketing): add user logo management module

Users can now save uploaded logos to the backend (marketing_user_logos table),
avoiding repeated uploads. Includes CRUD endpoints: list, save, delete with
a per-user limit of 10 logos.

Made-with: Cursor

internal/routes/marketing_routes.go

@@ -13,6 +13,7 @@ func registerMarketingRoutes(
 	categoryHandler *marketinghandler.CategoryHandler,
 	templateHandler *marketinghandler.TemplateHandler,
 	downloadHandler *marketinghandler.DownloadHandler,
+	userLogoHandler *marketinghandler.UserLogoHandler,
 ) {
 	if categoryHandler == nil || templateHandler == nil || downloadHandler == nil {
 		return
@@ -30,6 +31,12 @@ func registerMarketingRoutes(
 		protectedMarketing.POST("/downloads", downloadHandler.Create)
 		protectedMarketing.POST("/ad_callback", downloadHandler.AdCallback)
 		protectedMarketing.GET("/downloads", downloadHandler.ListByUser)
+
+		if userLogoHandler != nil {
+			protectedMarketing.GET("/logos", userLogoHandler.List)
+			protectedMarketing.POST("/logos", userLogoHandler.Save)
+			protectedMarketing.DELETE("/logos/:id", userLogoHandler.Delete)
+		}
 	}
 
 	admin := api.Group("/admin/marketing")