fix: udp handling and ipv4 and ipv6 filtering

demo/Dockerfile

@@ -0,0 +1,36 @@
+# syntax=docker/dockerfile:1
+
+# build stage - compile snitch
+FROM golang:1.25.0-bookworm AS builder
+WORKDIR /src
+COPY . .
+RUN --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=cache,target=/root/.cache/go-build \
+    go build -o snitch .
+
+# runtime stage - official vhs image has ffmpeg, chromium, ttyd pre-installed
+FROM ghcr.io/charmbracelet/vhs
+
+# install only lightweight tools for fake services
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+    --mount=type=cache,target=/var/lib/apt,sharing=locked \
+    apt-get update --allow-releaseinfo-change && apt-get install -y --no-install-recommends \
+    netcat-openbsd \
+    procps \
+    socat \
+    nginx-light
+
+WORKDIR /app
+
+# copy built binary from builder
+COPY --from=builder /src/snitch /app/snitch
+
+# copy demo files
+COPY demo/demo.tape /app/demo.tape
+COPY demo/entrypoint.sh /app/entrypoint.sh
+RUN chmod +x /app/entrypoint.sh
+
+ENV TERM=xterm-256color
+ENV COLORTERM=truecolor
+
+ENTRYPOINT ["/app/entrypoint.sh"]