Added Missing return Type to bit32.replace

[Pspritechologist]

The docs state here that the function Returns a copy ....

[github-actions]

中文：该改动为 bit32.replace 添加了 ---@return integer 注解，与 bit32.extract 的文档风格一致，且符合 Lua 5.2+ 中 bit32.replace 返回整数的实际行为，未发现 bug、安全或回归问题。
English: This change adds a ---@return integer annotation to bit32.replace, consistent with the documentation style of bit32.extract and matching the actual behavior of bit32.replace returning an integer in Lua 5.2+, with no bugs, security, or regression issues found.

中文：审查总结：改动仅涉及类型注解（meta/template 文件），属于纯文档/类型信息补充，不影响运行时逻辑，风险极低，可以合并。
English: Review summary: The change only touches a type annotation in a meta/template file, purely supplementing documentation/type information without affecting runtime logic. Risk is minimal and it can be merged.