Fix: Use entrypoint.py to start Celery worker + Redis sidecar

- Root cause: Dockerfile was calling uvicorn directly, skipping entrypoint.py
- entrypoint.py starts 3 processes: redis-server, celery worker, uvicorn
- Without worker, bulk validation tasks queue but never process
- Adds redis-server to apt-get install for sidecar mode
- Fixes bulk validation failures at ~49% progress (timeout after 10min)

Issue: Supply chain_valid CSV failed at 2000/4041 emails
Health check showed: celery.available = false

Dockerfile

@@ -1,24 +1,27 @@
-FROM python:3.11-slim
-
-WORKDIR /app
-
-# Install system dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    curl \
-    git \
-    build-essential \
-    && rm -rf /var/lib/apt/lists/*
-
-# Install Python dependencies
-# torch CPU FIRST (the PyPI default wheel is the CUDA build, ~2.5 GB) — the
-# DistilBERT advisory layer runs on PyTorch (the ONNX export was unreliable).
-RUN pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
-
-# Copy app source
-COPY app/ ./app/
-
-EXPOSE 7860
-
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]
+FROM python:3.11-slim
+WORKDIR /app
+
+# Install system dependencies + redis-server for sidecar
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    git \
+    build-essential \
+    redis-server \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies
+# torch CPU FIRST (the PyPI default wheel is the CUDA build, ~2.5 GB) — the
+# DistilBERT advisory layer runs on PyTorch (the ONNX export was unreliable).
+RUN pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy app source AND entrypoint
+COPY app/ ./app/
+COPY entrypoint.py .
+
+EXPOSE 7860
+
+# Use the entrypoint that starts redis + celery worker + uvicorn
+CMD ["python3", "entrypoint.py"]