Add Core Hub staging deployment profile

Dockerfile

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+# Stage 1: install production dependencies into an isolated virtualenv.
+FROM python:3.12-slim AS builder
+
+RUN pip install uv --no-cache-dir
+WORKDIR /app
+
+COPY pyproject.toml uv.lock README.md ./
+COPY src/ ./src/
+COPY alembic.ini ./
+COPY migrations/ ./migrations/
+COPY scripts/ ./scripts/
+
+RUN uv sync --no-dev --frozen
+
+# Stage 2: runtime image for API and migration job commands.
+FROM python:3.12-slim AS runtime
+
+WORKDIR /app
+COPY --from=builder /app/.venv /app/.venv
+COPY --from=builder /app/src /app/src
+COPY --from=builder /app/alembic.ini /app/alembic.ini
+COPY --from=builder /app/migrations /app/migrations
+COPY --from=builder /app/scripts /app/scripts
+
+ENV PATH="/app/.venv/bin:$PATH"
+ENV PYTHONPATH="/app/src"
+ENV CORE_HUB_ENV="staging"
+ENV CORE_HUB_AUTO_CREATE_TABLES="0"
+
+EXPOSE 8010
+CMD ["uvicorn", "core_hub.app:app", "--host", "0.0.0.0", "--port", "8010"]