feat: add NVIDIA Prime environment variables for Linux hybrid graphics (#155)HEADmain

## Summary
- Inject __NV_PRIME_RENDER_OFFLOAD=1 and
__GLX_VENDOR_LIBRARY_NAME=nvidia environment variables when launching
Minecraft on Linux
- Enables discrete GPU usage on Linux systems with hybrid graphics
(NVIDIA + Intel/AMD)
- Only applies on Linux via #[cfg(target_os = "linux")]

## Changes
- Modified src-tauri/src/main.rs to inject NVIDIA Prime environment
variables before spawning the Java process

## Test Plan
- On a Linux system with hybrid graphics (NVIDIA + Intel/AMD), launch
the game and verify the discrete GPU is being used
- Can check with nvidia-smi or glxinfo to confirm GPU usage

Closes #154

## Summary by Sourcery

Inject GPU-related environment variables when launching the game on
Linux to support hybrid graphics configurations.

New Features:
- Enable discrete GPU usage on Linux hybrid graphics systems by setting
NVIDIA Prime and AMD DRI_PRIME environment variables before starting the
game process.

Enhancements:
- Log when GPU environment variables are injected on Linux to aid
debugging of hybrid graphics setups.

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Co-authored-by: 简律纯 <i@jyunko.cn>
Co-authored-by: sourcery-ai[bot] <58596630+sourcery-ai[bot]@users.noreply.github.com>

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