chore: import upstream snapshot with attribution

docker/Dockerfile

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+ARG PYTHON_VERSION=3.11
+FROM python:${PYTHON_VERSION}-slim
+
+ARG LEANN_VERSION=0.3.6
+
+ENV PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    PIP_ROOT_USER_ACTION=ignore
+
+# Keep runtime image minimal while ensuring common C++ runtime libs are present.
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        libgomp1 \
+        libstdc++6 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN python -m pip install --upgrade pip \
+    && pip install --prefer-binary "leann==${LEANN_VERSION}" \
+    && python -c "import leann; import leann_backend_hnsw; import leann_backend_diskann"
+
+WORKDIR /workspace
+
+CMD ["python", "-c", "import leann; print('LEANN installed and importable.')"]

docker/Dockerfile.cpu

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+ARG PYTHON_VERSION=3.11
+FROM python:${PYTHON_VERSION}-slim
+
+ARG LEANN_VERSION=0.3.6
+
+ENV PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    PIP_ROOT_USER_ACTION=ignore \
+    PIP_INDEX_URL=https://download.pytorch.org/whl/cpu \
+    PIP_EXTRA_INDEX_URL=https://pypi.org/simple
+
+# Keep runtime image minimal while ensuring common C++ runtime libs are present.
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        libgomp1 \
+        libstdc++6 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN python -m pip install --upgrade pip \
+    && pip install --prefer-binary "leann==${LEANN_VERSION}" \
+    && python -c "import leann; import leann_backend_hnsw; import leann_backend_diskann"
+
+WORKDIR /workspace
+
+CMD ["python", "-c", "import leann; print('LEANN installed and importable (CPU image).')"]

docker/Dockerfile.dev

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+ARG PYTHON_VERSION=3.11
+FROM python:${PYTHON_VERSION}-slim
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    PIP_ROOT_USER_ACTION=ignore
+
+# Build + test toolchain for local development in container.
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        build-essential \
+        cmake \
+        git \
+        swig \
+        libomp-dev \
+        libboost-all-dev \
+        protobuf-compiler \
+        libzmq3-dev \
+        pkg-config \
+        libabsl-dev \
+        libaio-dev \
+        libprotobuf-dev \
+        libopenblas-dev \
+        liblapack-dev \
+        liblapacke-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN python -m pip install --upgrade pip \
+    && pip install uv
+
+WORKDIR /workspace
+COPY . /workspace
+
+# Keep dependency install explicit; default includes lint + test groups.
+RUN uv sync --group lint --group test
+
+CMD ["/bin/bash"]

docker/README.md

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+# Docker Setup
+
+This folder provides reference Docker images for LEANN.
+
+## Build (default)
+
+Default image (no forced CPU index):
+
+```bash
+docker build -f docker/Dockerfile docker -t leann:latest
+```
+
+## Build (CPU)
+
+CPU-optimized image (forces PyTorch CPU index):
+
+```bash
+docker build \
+  --build-arg PYTHON_VERSION=3.12 \
+  --build-arg LEANN_VERSION=0.3.6 \
+  -f docker/Dockerfile.cpu docker -t leann:cpu
+```
+
+## Build (development)
+
+Development image (source tree + build/test toolchain + `uv sync`):
+
+```bash
+docker build -f docker/Dockerfile.dev . -t leann:dev
+```
+
+## Run
+
+```bash
+docker run --rm leann:latest
+docker run --rm leann:cpu
+docker run --rm -it leann:dev
+```
+
+Expected output:
+
+```text
+LEANN installed and importable.
+```
+
+## Notes
+
+- Both images keep LEANN package semantics unchanged (`pip install leann` with both backends).
+- `Dockerfile.cpu` uses the PyTorch CPU index to avoid downloading CUDA wheels.
+- `Dockerfile.dev` is for local development, not production deployment.