Initial backend import

Dockerfile

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+FROM golang:1.24-alpine AS build
+WORKDIR /src
+RUN apk add --no-cache git ca-certificates
+COPY go.mod go.sum* ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/server ./cmd/server
+
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates tzdata
+WORKDIR /app
+COPY --from=build /out/server /app/server
+COPY static /app/static
+RUN mkdir -p /app/uploads && cp /app/static/placeholder-cover.svg /app/uploads/placeholder-cover.svg
+ENV UPLOAD_DIR=/app/uploads
+EXPOSE 8080
+ENTRYPOINT ["/app/server"]