Add Django backend, Next.js frontend, and deploy templates

deploy/systemd/kkpab-frontend.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=KKPAB Next.js frontend
+After=network.target
+
+[Service]
+User=www-data
+Group=www-data
+WorkingDirectory=/var/www/kkpab/frontend
+EnvironmentFile=/var/www/kkpab/frontend/.env.local
+ExecStart=/usr/bin/npm run start
+Restart=always
+
+[Install]
+WantedBy=multi-user.target