feat(09-06): serve admin form schemas and match Winter relations

- GET schema/form localizes the compiled form after the permission check
- relation: genre resolves to the exported Go field without changing the YAML key

cabana/list_schema.go

@@ -330,6 +330,9 @@ func listModelContract(ctl pact.AdminController) (map[string]struct{}, map[strin
 		}
 		if isListRelation(field.Type) {
 			rels[field.Name] = struct{}{}
+			// Winter YAML spells relations in lowercase (relation: genre)
+			// while the Go field is exported (Genre).
+			rels[strings.ToLower(field.Name)] = struct{}{}
 			continue
 		}
 		name := gormColumn(field)