feat: add Dockerfiles, nginx config, serve frontend from Rust backend

Dockerfile

@@ -1,26 +1,16 @@
-# Build frontend
-FROM node:20-alpine AS frontend-build
-WORKDIR /app
-COPY frontend/package.json frontend/package-lock.json ./
-RUN npm ci
-COPY frontend/ .
-RUN npm run build
-
-# Build Rust backend
-FROM rust:1.75 AS rust-builder
+# Build stage
+FROM rust:1.80-slim AS builder
 WORKDIR /app
 COPY Cargo.toml Cargo.lock ./
-COPY src/ ./src/
+RUN mkdir src && echo "fn main() {}" > src/main.rs
+RUN cargo build --release
+COPY src ./src
 RUN cargo build --release
-RUN cp target/release/hello-web /app/hello-web
 
-# Final image
+# Production stage
 FROM debian:bookworm-slim
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    ca-certificates \
-    && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
-COPY --from=rust-builder /app/hello-web /app/hello-web
-COPY --from=frontend-build /app/dist /app/frontend/dist
+COPY --from=builder /app/target/release/hello-web /app/hello-web
 EXPOSE 3000
 CMD ["/app/hello-web"]