Replace pip with uv in documentation and workflows

[Copilot]

Migrate Python tooling from pip to uv across all documentation and GitHub Actions workflows.

Documentation

• README.md: pip install → uv pip install
• docs/examples/basic.md: Updated example commands
• docs/getting-started/installation.md: Updated install commands, changed venv creation to uv venv

GitHub Actions Workflows

All Python workflows now use astral-sh/setup-uv@v7 with caching enabled:

• docs.yml: uv sync --locked --extra docs + uv run mike
• pytest.yml: uv sync --locked --all-extras --dev + uv run pytest
• example.yml: uv sync --locked + uv run python

- uses: astral-sh/setup-uv@v7
  with:
    python-version: ${{ matrix.python-version }}
    enable-cache: true

- run: uv sync --locked --all-extras --dev
- run: uv run pytest --cov=pyds

Original prompt

---

This section details on the original issue you should resolve

<issue_title>使用uv生态而不是pip在文档和workflow中</issue_title>
<issue_description></issue_description>

<agent_instructions>目前存在pip的地方:

1. README.md
2. docs/examples/basic.md
3. docs/getting-started/installation.md
4. .github/workflows/docs.yml
5. .github/workflows/pytest.yml
6. .github/workflows/example.yml

关于uv在github action中的使用, 你可能需要参考 https://docs.astral.sh/uv/guides/integration/github/
其中关键内容是:

      - uses: astral-sh/setup-uv@v7
        with:
          python-version: ${{ matrix.python-version }}

- name: build
  run: uv sync --locked --all-extras --dev

- name: Enable caching
  uses: astral-sh/setup-uv@v7
  with:
    enable-cache: true
```</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes 使用uv生态而不是pip在文档和workflow中 #42

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