feat: Major updates to backend structure and security enhancements

- Removed `COMMON_ERRORS.md` file to streamline documentation.
- Added `Flask-Limiter` for rate limiting and `redis` for session management in `requirements.txt`.
- Expanded `ROADMAP.md` to include completed security features and planned enhancements for version 2.2.
- Enhanced `setup_myp.sh` for ultra-secure kiosk installation, including system hardening and security configurations.
- Updated `app.py` to integrate CSRF protection and improved logging setup.
- Refactored user model to include username and active status for better user management.
- Improved job scheduler with uptime tracking and task management features.
- Updated various templates for a more cohesive user interface and experience.

backend/app/node_modules/dlv/index.js

@@ -0,0 +1,7 @@
+export default function dlv(obj, key, def, p, undef) {
+	key = key.split ? key.split('.') : key;
+	for (p = 0; p < key.length; p++) {
+		obj = obj ? obj[key[p]] : undef;
+	}
+	return obj === undef ? def : obj;
+}