feat: production-ready domain control dashboard

Dockerfile

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+# syntax=docker/dockerfile:1.7
+FROM golang:1.25.12-alpine AS build
+
+RUN apk add --no-cache build-base
+WORKDIR /src
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=1 GOOS=linux go build -trimpath -ldflags="-s -w" -o /out/dyndns-web ./cmd/dyndns-web
+
+FROM alpine:3.23.2 AS runtime
+
+RUN apk add --no-cache ca-certificates && \
+    addgroup -S -g 10001 dyndns && \
+    adduser -S -D -H -u 10001 -G dyndns dyndns && \
+    mkdir -p /data && chown dyndns:dyndns /data
+
+COPY --from=build /out/dyndns-web /usr/local/bin/dyndns-web
+
+USER dyndns:dyndns
+WORKDIR /data
+EXPOSE 8080
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 CMD ["/usr/local/bin/dyndns-web", "healthcheck"]
+
+ENTRYPOINT ["/usr/local/bin/dyndns-web"]