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/busboy/test/test.js

@@ -0,0 +1,20 @@
+'use strict';
+
+const { spawnSync } = require('child_process');
+const { readdirSync } = require('fs');
+const { join } = require('path');
+
+const files = readdirSync(__dirname).sort();
+for (const filename of files) {
+  if (filename.startsWith('test-')) {
+    const path = join(__dirname, filename);
+    console.log(`> Running ${filename} ...`);
+    const result = spawnSync(`${process.argv0} ${path}`, {
+      shell: true,
+      stdio: 'inherit',
+      windowsHide: true
+    });
+    if (result.status !== 0)
+      process.exitCode = 1;
+  }
+}