Fix torchvision CPU index and Docker venv creation

Add torchvision to [tool.uv.sources] so it also comes from the CPU index
(piq depends on torchvision, which crashes on import with CPU-only torch
when installed from PyPI). Restore python3 -m venv in the Dockerfile so
pip install uv puts the uv binary into the venv's bin directory (which is
on PATH), rather than ~/.local/bin (which is not).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: adamtheturtle

pyproject.toml

@@ -140,6 +140,7 @@ version_scheme = "post-release"
 
 [tool.uv]
 sources.torch = { index = "pytorch-cpu" }
+sources.torchvision = { index = "pytorch-cpu" }
 index = [ { name = "pytorch-cpu", url = "https://download.pytorch.org/whl/cpu", explicit = true } ]
 
 [tool.ruff]

src/mock_vws/_flask_server/Dockerfile

@@ -16,7 +16,8 @@ ENV UV_PROJECT_ENVIRONMENT=/app/docker_venvs/.venv
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 
 WORKDIR /app
-RUN pip install --no-cache-dir uv==0.10.4 && \
+RUN python3 -m venv $VIRTUAL_ENV && \
+    pip install --no-cache-dir uv==0.10.4 && \
     uv sync --no-cache
 EXPOSE 5000
 ENTRYPOINT ["python"]