Add uv (Astral Python package manager) support

- Add uv package manager implementation following pip pattern
- Configure MITM proxy with CA bundle for PyPI packages
- Add shell integration (bash/zsh/fish/PowerShell)
- Conditional on --include-python flag
- Add 33 comprehensive E2E tests covering:
  - uv pip install/sync/compile commands
  - uv add for project dependencies
  - uv tool install for global tools
  - uv run --with for ephemeral dependencies
  - uv sync for project syncing
  - Malware blocking verification for all methods
- Update documentation and package.json
- Install uv in Docker test environment

test/e2e/Dockerfile

@@ -67,6 +67,10 @@ except Exception as exc:
     raise
 EOF
 
+# Install uv (Astral's fast Python package manager)
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh && \
+    echo 'source $HOME/.local/bin/env' >> ~/.bashrc
+
 # Copy and install Safe chain
 COPY --from=builder /app/*.tgz /pkgs/
 RUN npm install -g /pkgs/*.tgz