feat(scrobble): send Subsonic scrobble on playback start (now-playing)

Dockerfile

@@ -0,0 +1,25 @@
+FROM python:3.11-alpine
+
+# Ensure deterministic, unbuffered logs
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+COPY requirements.txt requirements.txt
+
+RUN apk add --no-cache build-base ffmpeg libffi libffi-dev libsodium libsodium-dev \
+    && pip3 install --no-cache-dir -r requirements.txt \
+    && apk del build-base libffi-dev libsodium-dev
+
+RUN adduser -D -h /app app \
+    && chown -R app:app /app
+
+COPY --chown=app:app . .
+
+USER app
+
+# Set stop signal to SIGTERM to ensure clean shutdown
+STOPSIGNAL SIGTERM
+
+CMD ["python3", "/app/discodrome.py"]