Fix Docker build: use proper uv commands following best practices

- Use 'uv sync --no-install-project' to install dependencies first
- Use 'uv run python setup.py bdist_wheel' for compilation with proper environment
- Use 'uv sync --no-dev' for final project installation
- Use 'uv run python' for execution (packages already installed, no reinstall)
- Follows uv Docker integration best practices

Dockerfile

@@ -42,29 +42,26 @@ ENV HOME=/home/user \
     GRADIO_SERVER_PORT=7860 \
     UV_CACHE_DIR=/home/user/.cache/uv
 
-# Copy Docker-specific dependency files
+# Copy dependency files for layer caching
 COPY --chown=user pyproject.docker.toml ./pyproject.toml
 
 # Set CUDA compilation flags for HF Spaces GPU compatibility
 ENV TORCH_CUDA_ARCH_LIST="6.0;6.1;7.0;7.5;8.0;8.6;8.9;9.0" \
     FORCE_CUDA=1
 
-# Create virtual environment first
-RUN uv venv .venv
-
-# Install PyTorch and basic dependencies first (needed for gsplat compilation)
+# Install dependencies without the project first (for better caching)
 RUN --mount=type=cache,target=/tmp/uv-cache,sharing=locked,uid=1000,gid=1000 \
-    UV_CACHE_DIR=/tmp/uv-cache .venv/bin/pip install torch torchvision numpy
+    UV_CACHE_DIR=/tmp/uv-cache uv sync --no-install-project --no-dev
 
 # Copy gsplat source and build wheel for target architecture
 COPY --chown=user gsplat/ ./gsplat/
 RUN cd gsplat && \
-    ../.venv/bin/python setup.py bdist_wheel && \
+    uv run python setup.py bdist_wheel && \
     mkdir -p ../wheels && \
     cp dist/*.whl ../wheels/ && \
     cd ..
 
-# Install all remaining dependencies with the fresh-built wheel
+# Install the project with the fresh-built wheel
 RUN --mount=type=cache,target=/tmp/uv-cache,sharing=locked,uid=1000,gid=1000 \
     UV_CACHE_DIR=/tmp/uv-cache uv sync --no-dev
 
@@ -77,5 +74,5 @@ COPY --chown=user pyproject.docker.toml ./pyproject.toml
 # Expose port 7860 (default for HF Spaces)
 EXPOSE 7860
 
-# Activate venv and launch the Gradio app directly
-CMD [".venv/bin/python", "gradio_app.py"]
+# Launch the Gradio app using uv run (but packages already installed, so no reinstall)
+CMD ["uv", "run", "python", "gradio_app.py"]