containerize and add basic setup to backend

ui/Dockerfile

@@ -0,0 +1,31 @@
+FROM node:24-slim AS base
+
+ENV PNPM_HOME="/pnpm"
+ENV PATH="$PNPM_HOME:$PATH"
+RUN corepack enable
+
+FROM base AS prod
+WORKDIR /app
+
+COPY pnpm-lock.yaml .
+RUN pnpm fetch --prod
+
+FROM base AS build
+WORKDIR /app
+
+COPY pnpm-lock.yaml .
+COPY package.json .
+RUN pnpm install
+
+COPY . .
+RUN pnpm run build
+
+FROM base AS runner
+COPY --from=prod /app/node_modules /app/node_modules
+COPY --from=build /app/build build/
+
+EXPOSE 3000
+
+ENV NODE_ENV=production
+
+CMD ["node", "build"]