Initial 423down proxy service

Dockerfile

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+FROM golang:1.26.3-alpine AS build
+
+WORKDIR /src
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/423down-proxy .
+
+FROM alpine:3.22
+
+RUN apk add --no-cache ca-certificates
+
+WORKDIR /app
+
+COPY --from=build /out/423down-proxy ./423down-proxy
+
+RUN mkdir -p /app/db
+
+EXPOSE 18089
+
+VOLUME ["/app/db"]
+
+ENTRYPOINT ["./423down-proxy"]