初始提交：短剧库源码（含转码优化 ultrafast）

Dockerfile

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+FROM golang:1.26-bookworm AS build
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY main.go ./
+COPY internal ./internal
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/juku .
+
+FROM debian:bookworm-slim
+ENV TZ=Asia/Shanghai
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates ffmpeg tzdata tini curl && rm -rf /var/lib/apt/lists/* && groupadd --gid 1000 juku && useradd --uid 1000 --gid juku --no-create-home juku && mkdir -p /data /downloads && chown juku:juku /data /downloads
+COPY --from=build /out/juku /usr/local/bin/juku
+USER 1000:1000
+WORKDIR /data
+VOLUME ["/data", "/downloads"]
+EXPOSE 8998
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 CMD curl --noproxy '*' --fail --silent --output /dev/null http://127.0.0.1:8998/ || exit 1
+ENTRYPOINT ["/usr/bin/tini", "--", "/usr/local/bin/juku"]
+CMD ["-open=false", "-listen", "0.0.0.0:8998", "-data-dir", "/data", "-out", "/downloads", "-ffmpeg", "/usr/bin/ffmpeg"]