[WIP] Update path class and deprecate old functions (#3287)

* Initial plan

* feat: 为 AstrbotPaths 添加全面测试，覆盖率达到 100%

Co-authored-by: LIghtJUNction <106986785+LIghtJUNction@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: LIghtJUNction <106986785+LIghtJUNction@users.noreply.github.com>

Author: Copilot