Refactor code structure for improved readability and maintainability

workers/audio-denoise/Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+# ffmpeg (with arnndn/afftdn filters) + curl for model download
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends ffmpeg ca-certificates curl && \
+    rm -rf /var/lib/apt/lists/*
+
+# Download a standard RNNoise model for ffmpeg's arnndn filter.
+# Source: GregorR/rnnoise-models (beguiling-drafts, a widely used general model).
+# Non-fatal: if the download fails, handler.py falls back to afftdn.
+RUN mkdir -p /app/models && \
+    ( curl -fsSL -o /app/models/rnnoise.rnnn \
+        https://raw.githubusercontent.com/GregorR/rnnoise-models/master/beguiling-drafts-2018-08-30/bd.rnnn \
+      || echo "WARNING: RNNoise model download failed; will fall back to afftdn" )
+
+COPY workers/audio-denoise/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY workers/audio-denoise/handler.py .
+
+CMD ["python3", "-u", "handler.py"]