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/.bin/autoprefixer

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+../autoprefixer/bin/autoprefixer

backend/app/node_modules/.bin/browserslist

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+../browserslist/cli.js

backend/app/node_modules/.bin/cssesc

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+../cssesc/bin/cssesc

backend/app/node_modules/.bin/glob

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+../glob/dist/esm/bin.mjs

backend/app/node_modules/.bin/jiti

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+../jiti/bin/jiti.js

backend/app/node_modules/.bin/nanoid

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+../nanoid/bin/nanoid.cjs

backend/app/node_modules/.bin/node-which

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+../which/bin/node-which

backend/app/node_modules/.bin/resolve

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+../resolve/bin/resolve

backend/app/node_modules/.bin/sucrase

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+../sucrase/bin/sucrase

backend/app/node_modules/.bin/sucrase-node

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+../sucrase/bin/sucrase-node

backend/app/node_modules/.bin/tailwind

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+../tailwindcss/lib/cli.js

backend/app/node_modules/.bin/tailwindcss

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+../tailwindcss/lib/cli.js

backend/app/node_modules/.bin/update-browserslist-db

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+../update-browserslist-db/cli.js

backend/app/node_modules/.bin/yaml

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+../yaml/bin.mjs