fix: use manylinux2014 for Colab compatibility

- Switch from manylinux_2_28 to manylinux2014 (provides manylinux_2_17)
- This should produce wheels compatible with manylinux_2_35_x86_64 requirement
- Update package manager from dnf to yum for CentOS 7
- Use cmake3 with symlink for compatibility

MANYLINUX_BUILD_STRATEGY.md

@@ -1,77 +1,50 @@
 # Manylinux Build Strategy
 
-## 问题概述
+## Problem
+Google Colab requires wheels compatible with `manylinux_2_35_x86_64` or earlier. Our previous builds were producing `manylinux_2_39_x86_64` wheels, which are incompatible.
 
-Colab和许多Linux环境需要`manylinux`兼容的wheels，而不是特定于某个Linux发行版的wheels。我们之前的尝试过于复杂，试图手动处理所有的依赖关系。
+## Solution
+We're using `cibuildwheel` with `manylinux2014` images to build wheels that are compatible with a wide range of Linux distributions, including Google Colab.
 
-## 新策略
+### Key Changes
 
-基于社区最佳实践和其他成功项目的经验，我们采用了以下简化方案：
+1. **cibuildwheel Configuration**
+   - Using `manylinux2014` images (provides `manylinux_2_17` compatibility)
+   - Using `yum` package manager (CentOS 7 based)
+   - Installing `cmake3` and creating symlink for compatibility
 
-### 1. 使用 cibuildwheel
+2. **Build Matrix**
+   - Python versions: 3.9, 3.10, 3.11, 3.12, 3.13
+   - Platforms: Linux (x86_64), macOS
+   - No Windows support (not required)
 
-`cibuildwheel`是PyPA推荐的构建多平台wheels的工具，它：
-- 自动处理manylinux环境设置
-- 管理不同Python版本的构建
-- 提供标准化的测试框架
+3. **Dependencies**
+   - Linux: gcc-c++, boost-devel, zeromq-devel, openblas-devel, cmake3
+   - macOS: boost, zeromq, openblas, cmake (via Homebrew)
 
-### 2. 使用 manylinux_2_28
+4. **Environment Variables**
+   - `CMAKE_BUILD_PARALLEL_LEVEL=8`: Speed up builds
+   - `Python_FIND_VIRTUALENV=ONLY`: Help CMake find Python in cibuildwheel env
+   - `Python3_FIND_VIRTUALENV=ONLY`: Alternative variable for compatibility
 
-- 从`manylinux2014`升级到`manylinux_2_28`
-- 提供更现代的基础库
-- 使用`dnf`而不是`yum`
-- 更好地支持现代Python版本
+## Testing Strategy
 
-### 3. CMake配置
+1. **CI Pipeline**: `test-manylinux.yml`
+   - Triggers on PR to main, manual dispatch, or push to `fix/manylinux-*` branches
+   - Builds wheels using cibuildwheel
+   - Tests installation on Ubuntu 22.04 (simulating Colab)
 
-在`pyproject.toml`中添加：
-```toml
-[tool.scikit-build.cmake.define]
-Python_FIND_VIRTUALENV = "ONLY"
-Python3_FIND_VIRTUALENV = "ONLY"
-```
+2. **Local Testing**
+   ```bash
+   # Download built wheels
+   # Test in fresh environment
+   python -m venv test_env
+   source test_env/bin/activate
+   pip install leann_core-*.whl leann_backend_hnsw-*manylinux*.whl leann-*.whl
+   python -c "from leann import LeannBuilder; print('Success!')"
+   ```
 
-这帮助CMake在cibuildwheel的虚拟环境中正确找到Python。
-
-### 4. 简化的依赖安装
-
-只安装必要的系统依赖：
-- `gcc-c++`
-- `boost-devel`
-- `zeromq-devel`
-- `openblas-devel`
-- `cmake`
-
-## 测试策略
-
-1. **手动触发**: 使用`workflow_dispatch`在GitHub Actions上测试
-2. **自动测试**: 在`fix/manylinux-*`分支上推送时自动运行
-3. **PR测试**: 当PR修改相关文件时自动测试
-
-## 如何使用
-
-### 在本地测试
-```bash
-# 安装cibuildwheel
-pip install cibuildwheel
-
-# 构建wheels
-cibuildwheel --platform linux packages/leann-backend-hnsw
-```
-
-### 在GitHub Actions测试
-1. 推送到`fix/manylinux-compatibility`分支
-2. 或手动触发"Test Manylinux Build"工作流
-
-## 下一步
-
-1. **监控CI运行结果**
-2. **根据错误调整依赖**
-3. **测试生成的wheels在Colab的兼容性**
-4. **如果成功，将更改合并到main**
-
-## 参考
-
-- [cibuildwheel文档](https://cibuildwheel.readthedocs.io/)
-- [manylinux规范](https://github.com/pypa/manylinux)
-- [scikit-build-core文档](https://scikit-build-core.readthedocs.io/) 
+## References
+- [cibuildwheel documentation](https://cibuildwheel.readthedocs.io/)
+- [manylinux standards](https://github.com/pypa/manylinux)
+- [PEP 599 - manylinux2014](https://peps.python.org/pep-0599/)