feat: add Radarr language dashboard with Docker support

Add a Flask-based dashboard for monitoring audio/subtitle languages in Radarr media files. Includes ffprobe integration for media analysis, SQLite caching, path mapping between Radarr and host filesystems, and a responsive web UI with filtering and statistics.

Dockerfile

@@ -0,0 +1,11 @@
+FROM python:3.13-slim
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ffmpeg \
+    && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY app.py .
+COPY templates ./templates
+EXPOSE 8099
+CMD ["gunicorn", "--bind", "0.0.0.0:8099", "--workers", "2", "--threads", "4", "--timeout", "120", "app:app"]