feat: initialize backend and frontend structure with Docker support

- Added backend package.json with dependencies for Express, MySQL, and EJS.
- Created server.js for backend server setup with basic routing and error handling.
- Added EJS view for the index page.
- Set up Docker Compose configuration for frontend, backend, and MySQL database services.
- Created Dockerfile for frontend build process using Node and Nginx.
- Configured Nginx for serving frontend application.
- Implemented i18n setup for internationalization with English and German language support.
- Added localization files for English and German languages.

frontend/package.json

@@ -16,8 +16,10 @@
     "@mui/icons-material": "^7.3.6",
     "@mui/material": "^7.3.6",
     "@mui/styled-engine-sc": "^7.3.6",
+    "js-cookie": "^3.0.5",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
+    "react-i18next": "^16.2.0",
     "react-router-dom": "^7.11.0",
     "styled-components": "^6.1.19"
   },