All tweaks added

milevault_export/backend/Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl build-essential libpq-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+# Single worker avoids race condition during DB initialization.
+# For a personal app this is fine; async handles concurrent requests well.
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]