feat: 添加服务管理脚本和Dockerfile

Dockerfile

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+FROM golang:1.22-alpine AS builder
+
+WORKDIR /build
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN go build -o ftp-server .
+
+FROM alpine:3.19
+
+RUN apk add --no-cache ca-certificates tzdata
+ENV TZ=Asia/Shanghai
+
+WORKDIR /app
+COPY --from=builder /build/ftp-server .
+COPY static/ ./static/
+
+RUN mkdir -p /app/data /app/ftp_root
+
+EXPOSE 2121 8080 50000-50100
+
+VOLUME ["/app/data", "/app/ftp_root", "/app/config.json"]
+
+ENTRYPOINT ["./ftp-server"]
+CMD ["-config", "/app/config.json"]