Add initial Restreamer implementation for YouTube-to-Jellyfin live restreaming

Dockerfile

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+FROM python:3.12-slim
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ffmpeg \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN pip install --no-cache-dir poetry==2.4.1
+ENV POETRY_VIRTUALENVS_CREATE=false
+
+WORKDIR /app
+
+COPY pyproject.toml poetry.lock ./
+RUN poetry install --only main --no-root --no-interaction
+
+COPY src/ src/
+COPY serve.py ./
+
+ENV PYTHONPATH=/app/src
+
+EXPOSE 8000
+
+CMD ["python", "serve.py"]