dev: add some useapi exports to CoreModule

src/backend/src/CoreModule.js

@@ -23,6 +23,7 @@ const { NotificationES } = require("./om/entitystorage/NotificationES");
 const { ProtectedAppES } = require("./om/entitystorage/ProtectedAppES");
 const { Context } = require('./util/context');
 const { LLOWrite } = require("./filesystem/ll_operations/ll_write");
+const { LLRead } = require("./filesystem/ll_operations/ll_read");
 
 
 
@@ -80,6 +81,7 @@ const install = async ({ services, app, useapi, modapi }) => {
         def('core.util.helpers', require('./helpers'));
         def('core.util.permission', require('./services/auth/PermissionService').PermissionUtil);
         def('puter.middlewares.auth', require('./middleware/auth2'));
+        def('puter.middlewares.configurable_auth', require('./middleware/configurable_auth'));
         def('puter.middlewares.anticsrf', require('./middleware/anticsrf'));
         
         def('core.APIError', require('./api/APIError'));
@@ -95,8 +97,11 @@ const install = async ({ services, app, useapi, modapi }) => {
         // statement in English, so maybe it should be one statement of code.
         def('core.fs', {
             LLOWrite,
+            LLRead,
         });
         def('core.fs.selectors', require('./filesystem/node/selectors'));
+        def('core.util.stream', require('./util/streamutil'));
+        def('core.validation', require('@heyputer/backend-core-0').validation);
     });
     
     useapi.withuse(() => {