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.

backend/Dockerfile

@@ -0,0 +1,12 @@
+FROM node:20-alpine
+
+ENV NODE_ENV=production
+WORKDIR /backend
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY . .
+
+EXPOSE 8004
+CMD ["npm", "start"]