支持序列化及打包资源包及光影包

[WingChunWong]

What's Changed:

1. 支持序列化及打包资源包及光影包

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由 LLM 修改并均已在本地测试（很好的打包工具使我旋转）

Copilot's summary

This pull request adds support for handling "overrides" directories in Modrinth modpack projects and updates the documentation to clarify the recommended project structure. The changes introduce a new command for preparing override files, update command-line argument parsing to support this functionality, and document new standard folders for resource and shader packs.

Enhancements to Modrinth manager commands:

• Added support for a new o/overrides subcommand in the Manager class, which copies local files from config, mods, resourcepacks, and shaderpacks into the appropriate overrides or client-overrides directories, filtering out .mrf files from mods. This is implemented in the new PrepareOverrides method. [1] [2] [3]

Documentation improvements:

• Updated the modpack quick guide (modpack.md) to clarify that resource packs should be placed in ./src/resourcepacks and shader packs in ./src/shaderpacks, aligning the documentation with the new override handling logic.