feat: add Dockerfile and docker-compose.yml for containerization

Dockerfile

@@ -0,0 +1,27 @@
+# Build stage
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
+WORKDIR /src
+
+COPY octo-fiesta.sln .
+COPY octo-fiesta/octo-fiesta.csproj octo-fiesta/
+COPY octo-fiesta.Tests/octo-fiesta.Tests.csproj octo-fiesta.Tests/
+
+RUN dotnet restore
+
+COPY octo-fiesta/ octo-fiesta/
+COPY octo-fiesta.Tests/ octo-fiesta.Tests/
+
+RUN dotnet publish octo-fiesta/octo-fiesta.csproj -c Release -o /app/publish
+
+# Runtime stage
+FROM mcr.microsoft.com/dotnet/aspnet:9.0
+WORKDIR /app
+
+RUN mkdir -p /app/downloads
+
+COPY --from=build /app/publish .
+
+EXPOSE 8080
+ENV ASPNETCORE_URLS=http://+:8080
+
+ENTRYPOINT ["dotnet", "octo-fiesta.dll"]

docker-compose.yml

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+services:
+  octo-fiesta:
+    build: .
+    container_name: octo-fiesta
+    restart: unless-stopped
+    ports:
+      - "5274:8080"
+    environment:
+      - ASPNETCORE_ENVIRONMENT=Production
+      # Navidrome/Subsonic server URL
+      - Subsonic__Url=${SUBSONIC_URL:-http://localhost:4533}
+      # Download path inside container
+      - Library__DownloadPath=/app/downloads
+      # Deezer ARL token (required)
+      - Deezer__Arl=${DEEZER_ARL}
+      # Fallback ARL token (optional)
+      - Deezer__ArlFallback=${DEEZER_ARL_FALLBACK:-}
+    volumes:
+      - ${DOWNLOAD_PATH:-./downloads}:/app/downloads