Refactor: Extract shared constants, populate __init__.py, fix Python version constraint

[Copilot]

Repository cleanup to improve code organization and maintainability.

Changes

• Python version constraint: Relaxed requires-python = "==3.12.0" → ">=3.12.0" to allow installation on any 3.12.x
• Duplicate import: Removed duplicate from lightning import LightningDataModule in noisybwe.py
• Shared constants: Extracted LIST_OF_VIBRAVOX from bwe.py and stp.py into vibravox/constants.py
• Public API exports: Populated all __init__.py files with proper exports

New imports enabled

from vibravox import LIST_OF_VIBRAVOX, AVAILABLE_SENSORS
from vibravox.lightning_datamodules import BWELightningDataModule
from vibravox.lightning_modules import EBENLightningModule
from vibravox.metrics import NoresqaMOS
from vibravox.torch_modules.dnn import EBENGenerator

Original prompt

refactor the repo

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