chore(docker): add containerized development setup

frontend/.dockerignore

@@ -0,0 +1,7 @@
+.env
+.env.*
+node_modules
+.nuxt
+.output
+dist
+npm-debug.log*

frontend/.env.sample

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+NUXT_PUBLIC_API_BASE_URL=http://127.0.0.1:8080

frontend/Dockerfile

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+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"]