feat(root): add project management features and dependencies

Add Kanban board, epics, notifications, external sharing, and related API endpoints; update README and install required packages such as django‑q2, openpyxl, and others.

requirements.txt

@@ -10,3 +10,11 @@ mysqlclient>=2.2.8
 django-tailwind-cli>=4.6.2
 django-htmx>=1.27.0
 gunicorn>=26.0.0
+django-q2>=1.10.0
+openpyxl>=3.1.5
+requests>=2.34.2
+django-import-export>=4.4.1
+django-filter>=25.2
+drf-spectacular>=0.29.0
+django-browser-reload>=1.21.0
+pillow>=12.2.0