feat(services): init feature flags in the module manifest: 'manifest.features.API'

lib/inventory/distributed-service/service-module.nix

@@ -243,6 +243,28 @@ in
                 '';
                 type = types.str;
               };
+              features = mkOption {
+                description = ''
+                  Enable built-in features for the module
+
+                  See the documentation for each feature:
+                  - API
+                '';
+                type = types.submoduleWith {
+                  modules = [
+                    {
+                      options.API = mkOption {
+                        type = types.bool;
+                        default = false;
+                        description = ''
+                          Enables automatic API schema conversion for the interface of this module.
+                        '';
+                      };
+                    }
+                  ];
+                };
+                default = { };
+              };
             };
           }
         ];