initial commit: Artifacto v0.1

Self-hosted HTML artifact publisher. Single Go binary, SQLite metadata,
HTML on disk. Features: password-protected artifacts, per-artifact expiration,
admin dashboard with view metrics (privacy-preserving daily-salt visitor hash,
sparklines, 30-day SVG chart, top referrers), rate-limited unlock endpoint.

Packaged as a Docker image (two-stage, CGO_ENABLED=0, pure-Go SQLite).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Dockerfile

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+FROM golang:1.23-alpine AS build
+WORKDIR /src
+ENV CGO_ENABLED=0 GOFLAGS=-buildvcs=false
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN go build -ldflags="-s -w" -o /out/artifacto ./cmd/artifacto
+
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates tzdata wget && adduser -D -u 10001 app
+COPY --from=build /out/artifacto /usr/local/bin/artifacto
+VOLUME /data
+RUN mkdir -p /data && chown app:app /data
+USER app
+EXPOSE 3000
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget -qO- http://localhost:3000/healthz >/dev/null 2>&1 || exit 1
+ENTRYPOINT ["/usr/local/bin/artifacto"]