feat(config): group-level config source declaration#2298
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从 CommunityToolkit.Mvvm 的源生成器里抄来的办法
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放了这么久没人 review，罢了，直接合了 |
whitecat346
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Feb 7, 2026
* feat(config): group-level config source declaration * feat(config): 配置组单例支持从类型继承代码文档
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在 ConfigGroupAttribute 上写 source 参数以声明对全组生效的默认值，当配置项本身未声明 source 时将默认使用该值，逐级向上 fallback，最后 fallback 到
ConfigSource.Shared。此功能主要用于支持后期分离配置与状态存储。
顺便让 AI 改了点复用，已测试，应该没有问题。