Implement tiled multiplayer city simulation and scaling stages

Dockerfile

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+FROM node:22-bookworm-slim AS client
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run proto:generate && npm run typecheck && npm test && npm run build
+
+FROM rust:1-bookworm AS server
+WORKDIR /app
+COPY server server
+COPY proto proto
+RUN cargo build --release --locked --manifest-path server/Cargo.toml --bin citygen-server
+
+FROM node:22-bookworm-slim
+WORKDIR /app
+COPY --from=client /app/node_modules node_modules
+COPY --from=client /app/dist dist
+COPY --from=client /app/src src
+COPY --from=client /app/tools tools
+COPY --from=client /app/package.json package.json
+COPY --from=server /app/server/target/release/citygen-server /usr/local/bin/citygen-server
+ENV CITYGEN_BIND=0.0.0.0:3000
+VOLUME ["/app/public/cities", "/app/data"]
+EXPOSE 3000
+CMD ["citygen-server"]