feat: hide registration button when disabled (#287)

* add allow registration to API Summary

* code gen

* use env for troubleshooting

* disable registration toggle based on backend

backend/app/api/static/docs/docs.go

@@ -2425,6 +2425,9 @@ const docTemplate = `{
         "v1.ApiSummary": {
             "type": "object",
             "properties": {
+                "allowRegistration": {
+                    "type": "boolean"
+                },
                 "build": {
                     "$ref": "#/definitions/v1.Build"
                 },