feat: Portal and Category public APIs (#4946)

app/controllers/public/api/v1/portals_controller.rb

@@ -0,0 +1,11 @@
+class Public::Api::V1::PortalsController < PublicController
+  before_action :set_portal
+
+  def show; end
+
+  private
+
+  def set_portal
+    @portal = ::Portal.find_by!(slug: params[:slug], archived: false)
+  end
+end