Marketing Hub: RBAC, i18n (AR/EN), tasks overhaul, team/user merge, tutorial

Features:
- Full RBAC with 3 roles (superadmin/manager/contributor)
- Ownership tracking on posts, tasks, campaigns, projects
- Task system: assign to anyone, filter combobox, visibility scoping
- Team members merged into users table (single source of truth)
- Post thumbnails on kanban cards from attachments
- Publication link validation before publishing
- Interactive onboarding tutorial with Settings restart
- Full Arabic/English i18n with RTL layout support
- Language toggle in sidebar, IBM Plex Sans Arabic font
- Brand-based visibility filtering for non-superadmins
- Manager can only create contributors
- Profile completion flow for new users
- Cookie-based sessions (express-session + SQLite)

server/node_modules/is-lambda/README.md

@@ -0,0 +1,27 @@
+# is-lambda
+
+Returns `true` if the current environment is an [AWS
+Lambda](https://aws.amazon.com/lambda/) server.
+
+[![Build status](https://travis-ci.org/watson/is-lambda.svg?branch=master)](https://travis-ci.org/watson/is-lambda)
+[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](https://github.com/feross/standard)
+
+## Installation
+
+```
+npm install is-lambda
+```
+
+## Usage
+
+```js
+var isLambda = require('is-lambda')
+
+if (isLambda) {
+  console.log('The code is running on a AWS Lambda')
+}
+```
+
+## License
+
+MIT