[SOMA][BOT-3][INFRA] skeleton: project folder structure and all package manifests

soma/backend/Dockerfile

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+FROM python:3.11-slim
+
+# System deps
+RUN apt-get update && apt-get install -y \
+    gcc \
+    libpq-dev \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Install Python dependencies before copying app code
+# (layer cache: dependencies change less often than code)
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Create uploads directory
+RUN mkdir -p /app/uploads
+
+# Non-root user for security
+RUN addgroup --system appgroup && adduser --system --group appgroup
+RUN chown -R appgroup:appgroup /app
+USER appgroup
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "1"]