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/eastasianwidth/README.md

@@ -0,0 +1,32 @@
+# East Asian Width
+
+Get [East Asian Width](http://www.unicode.org/reports/tr11/) from a character.
+
+'F'(Fullwidth), 'H'(Halfwidth), 'W'(Wide), 'Na'(Narrow), 'A'(Ambiguous) or 'N'(Natural).
+
+Original Code is [東アジアの文字幅 (East Asian Width) の判定 - 中途](http://d.hatena.ne.jp/takenspc/20111126#1322252878).
+
+## Install
+
+    $ npm install eastasianwidth
+
+## Usage
+
+    var eaw = require('eastasianwidth');
+    console.log(eaw.eastAsianWidth('￦')) // 'F'
+    console.log(eaw.eastAsianWidth('｡')) // 'H'
+    console.log(eaw.eastAsianWidth('뀀')) // 'W'
+    console.log(eaw.eastAsianWidth('a')) // 'Na'
+    console.log(eaw.eastAsianWidth('①')) // 'A'
+    console.log(eaw.eastAsianWidth('ف')) // 'N'
+
+    console.log(eaw.characterLength('￦')) // 2
+    console.log(eaw.characterLength('｡')) // 1
+    console.log(eaw.characterLength('뀀')) // 2
+    console.log(eaw.characterLength('a')) // 1
+    console.log(eaw.characterLength('①')) // 2
+    console.log(eaw.characterLength('ف')) // 1
+
+    console.log(eaw.length('あいうえお')) // 10
+    console.log(eaw.length('abcdefg')) // 7
+    console.log(eaw.length('￠￦｡ￜㄅ뀀¢⟭a⊙①بف')) // 19