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/object-inspect/.nycrc

@@ -0,0 +1,13 @@
+{
+  "all": true,
+  "check-coverage": false,
+  "instrumentation": false,
+  "sourceMap": false,
+  "reporter": ["text-summary", "text", "html", "json"],
+  "exclude": [
+    "coverage",
+    "example",
+    "test",
+    "test-core-js.js"
+  ]
+}