Update Dockerfile

Dockerfile

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+FROM rust:1.75-slim-bookworm AS builder
+# Build Rust backend here...
+
+FROM debian:bookworm-slim
+RUN useradd -m -u 1000 user
+USER user
+ENV HOME=/home/user
+ENV PATH="/home/user/.nix-profile/bin:/home/user/.cargo/bin:${PATH}"
+
+# Install Nix in single-user mode
+RUN curl -L https://nixos.org/nix/install | sh -s -- --no-daemon
+
+# Copy built assets
+COPY --from=builder /app/target/release/agent-backend /home/user/agent-backend
+COPY ./frontend/dist /home/user/dist
+
+WORKDIR /home/user
+EXPOSE 7860
+CMD ["./agent-backend"]