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/github-from-package/index.js

@@ -0,0 +1,17 @@
+module.exports = function (pkg) {
+    var m;
+    if (m = match(JSON.stringify(pkg.repository))) {
+        return m;
+    }
+    else if (m = match(JSON.stringify(pkg))) {
+        return m;
+    }
+    return undefined;
+};
+
+function match (str) {
+    var m = /\bgithub.com[:\/]([^\/"]+)\/([^\/"]+)/.exec(str);
+    if (m) {
+        return 'https://github.com/' + m[1] + '/' + m[2].replace(/\.git$/, '');
+    }
+}