wuxiaobai24

增加字数统计功能

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### Is your feature request related to a problem? 想要方便地看到某个memos的字数 ### Describe the solution you'd like 增加一个字数统计功能，例如：  ### Additional context _No response_

feat: Support Python 3.14 free-threaded

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This PR adds Python 3.14 free-threaded mode support to CocoIndex, resolving #1187 Key Changes: - Configure PyO3 for free-threaded mode (gil_used = false) - Add free-threaded feature and dependencies -...