Add uv-based environment setup and Blackwell GPU inference support

[takanotaiga]

Description

Previously, the project relied on a mamba-based environment setup, which lacked reproducibility and made dependency management harder to maintain.
Additionally, inference on NVIDIA Blackwell GPUs was not supported.

This PR introduces the following improvements:

• Migration to a uv-based environment setup for improved reproducibility and faster, more reliable environment creation.
• Upgrade to CUDA 12.9 and PyTorch 2.8, enabling inference support on the latest NVIDIA Blackwell architecture.
• Documentation updates to reflect the new build requirements, including the note that local CUDA installation is required for building.

Testing Environment

The updated environment and Blackwell-compatible inference pipeline were validated on the following hardware:

• NVIDIA RTX 6000 PRO Blackwell GPUs

[takanotaiga]

@gleize
Could you please review this?