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/yaml/browser/index.js

@@ -0,0 +1,5 @@
+// `export * as default from ...` fails on Webpack v4
+// https://github.com/eemeli/yaml/issues/228
+import * as YAML from './dist/index.js'
+export default YAML
+export * from './dist/index.js'

backend/app/node_modules/yaml/browser/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}