feat: initial architecture setup with Docker, SQLite persistence and PDF tracking

Dockerfile

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+# Use light python slim image
+FROM python:3.11-slim
+
+# Prevent python from writing pyc files to disk and buffering stdout/stderr
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+ENV NBU_INSIGHTS_RUNNING=1
+
+WORKDIR /app
+
+# Install system utilities needed for building packages
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements and install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application files
+COPY . .
+
+# Expose port used by Streamlit
+EXPOSE 8501
+
+# Run streamlit server bound to port 8501
+CMD ["streamlit", "run", "app.py", "--server.port=8501", "--server.address=0.0.0.0"]