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/better-sqlite3/lib/util.js

@@ -0,0 +1,12 @@
+'use strict';
+
+exports.getBooleanOption = (options, key) => {
+	let value = false;
+	if (key in options && typeof (value = options[key]) !== 'boolean') {
+		throw new TypeError(`Expected the "${key}" option to be a boolean`);
+	}
+	return value;
+};
+
+exports.cppdb = Symbol();
+exports.inspect = Symbol.for('nodejs.util.inspect.custom');