Add Built-in File Manager (Similar to Zalith Launcher)

[Shadow-zx]

Before making issue / 在发布提问之前...

• I understand this is a request, not a wish.我明白这是在提出请求而不是在许愿。

Description / 描述

It would be very helpful if FoldCraftLauncher included a built-in file manager, similar to the one in Zalith Launcher. This feature would allow users to easily access, organize, and manage Minecraft-related files (such as mods, resource packs, shader packs, and saves) directly within the launcher, without needing to switch to an external file manager.

Why / 原因

Eliminates issues caused by Android’s storage permission restrictions.

Improves usability and convenience by allowing file operations directly inside the launcher.

Makes it much easier for users (especially on Android 11+) to install or remove mods, resource packs, and shader packs.

Reduces confusion for new players who struggle to find the correct Minecraft directories.

[gjigjuntgurhkntuntg]

#1110