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/nginx.conf

@@ -0,0 +1,18 @@
+server {
+  listen 80;
+  server_name _;
+
+  root /usr/share/nginx/html;
+  index index.html;
+
+  location / {
+    try_files $uri $uri/ /index.html;
+  }
+
+  location ~* \.(?:js|mjs|css|png|jpg|jpeg|gif|ico|svg|woff2?)$ {
+    expires 1y;
+    access_log off;
+    add_header Cache-Control "public, immutable";
+    try_files $uri =404;
+  }
+}