Fix: Enhance out-of-the-box compatibility and resolve example path issues

[Shadowell]

This PR improves the initial setup experience for new users by fixing hardware compatibility, dependency deadlocks, and local file path errors in the examples:

• Hardware Compatibility : Replaced hardcoded device="cuda:0" with automatic fallback to CUDA, MPS (Apple Silicon), or CPU across all example scripts and README.md .
• Dependency Fixes : Relaxed huggingface_hub ( >=1.5.0 ) and pinned numpy<2.0.0 in requirements.txt to prevent pip installation deadlocks and C-API runtime crashes.
• Example Scripts Fixes :
  • Updated prediction_batch_example.py to fetch models directly from the Hugging Face Hub instead of relying on hardcoded local machine paths.
  • Corrected relative data paths in prediction examples ( ./data/... -> ../data/... ) to prevent FileNotFoundError when executing from the examples directory.
• Git Configuration : Added data/ and temporary data generation scripts to .gitignore to keep the repository clean from local test artifacts.