Add jukebox_maker web app v1.0

Go web application for filling USB drives with media files.
Runs in Docker on Unraid with /media, /mnt/usb, /config volumes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,22 @@
+FROM golang:1.22-alpine AS builder
+
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w" \
+    -o /out/jukebox ./cmd/jukebox
+
+FROM alpine:3.19
+
+RUN apk add --no-cache tzdata ca-certificates
+
+WORKDIR /app
+COPY --from=builder /out/jukebox .
+
+VOLUME ["/media", "/mnt/usb", "/config"]
+EXPOSE 8080
+
+ENTRYPOINT ["/app/jukebox"]
+CMD ["--config", "/config/config.json", "--addr", ":8080", "--media", "/media", "--mount", "/mnt/usb"]