chore(docker): add containerized development setup

frontend/Dockerfile

@@ -0,0 +1,25 @@
+FROM node:22-alpine AS build
+
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+FROM node:22-alpine
+
+ENV NODE_ENV=production \
+    NITRO_HOST=0.0.0.0 \
+    NITRO_PORT=3000
+
+WORKDIR /app
+
+COPY --from=build --chown=node:node /app/.output ./.output
+
+USER node
+
+EXPOSE 3000
+
+CMD ["node", ".output/server/index.mjs"]