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/tailwindcss/nesting/index.d.ts

@@ -0,0 +1,4 @@
+import type { AcceptedPlugin, PluginCreator } from 'postcss'
+
+declare const plugin: PluginCreator<AcceptedPlugin | string | void>
+export = plugin

backend/app/node_modules/tailwindcss/nesting/index.js

@@ -0,0 +1,2 @@
+let nesting = require('../lib/postcss-plugins/nesting')
+module.exports = (nesting.__esModule ? nesting : { default: nesting }).default