Docker stuff and folder watcher

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+# System deps for Pillow (image dimensions); kept minimal.
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+        libjpeg62-turbo \
+ && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY src/     /app/src/
+COPY main.py  /app/main.py
+
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1
+
+# Mount points used by main.py defaults
+VOLUME ["/mnt/suwayomi", "/mnt/kavita"]
+
+CMD ["python", "/app/main.py"]