Align backend plan with codebase

Dockerfile

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+# Optional production image (Next.js standalone output + Prisma).
+# Build: docker build -t community-rule .
+# Run: pass DATABASE_URL, SESSION_SECRET, etc. at runtime (see .env.example).
+
+FROM node:20-bookworm-slim AS base
+WORKDIR /app
+ENV NEXT_TELEMETRY_DISABLED=1
+
+FROM base AS deps
+RUN apt-get update -y && apt-get install -y openssl && rm -rf /var/lib/apt/lists/*
+COPY package.json package-lock.json ./
+RUN npm ci --no-audit --fund=false
+
+FROM base AS builder
+RUN apt-get update -y && apt-get install -y openssl && rm -rf /var/lib/apt/lists/*
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN npx prisma generate
+RUN npm run build
+
+FROM base AS runner
+RUN apt-get update -y && apt-get install -y openssl && rm -rf /var/lib/apt/lists/*
+ENV NODE_ENV=production
+RUN groupadd --system --gid 1001 nodejs && useradd --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=builder /app/prisma ./prisma
+
+USER nextjs
+EXPOSE 3000
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+CMD ["node", "server.js"]