Update CI workflow to use uv for testing and packaging; enhance development documentation on dependency management

.github/workflows/build.yml

@@ -15,20 +15,16 @@ jobs:
       - name: 检出代码
         uses: actions/checkout@v6
 
-      - name: 配置 Python
-        uses: actions/setup-python@v6
+      - name: 配置 uv
+        uses: astral-sh/setup-uv@v7
         with:
           python-version: "3.12"
-          cache: pip
-
-      - name: 安装测试依赖
-        run: python -m pip install numpy pytest
 
       - name: 运行测试
-        run: python -m pytest
+        run: uv run --frozen pytest
 
       - name: 构建扩展
-        run: python pack.py
+        run: uv run --frozen python pack.py
 
       - name: 上传扩展包
         uses: actions/upload-artifact@v7