Refactor : Architecture Refactor & English Translation

[Alter-404]

I propose to refactor the framework to enhance the architecture and switch the codebase to English.

Key changes

1. Replace iterative loops by vectorized operations.
2. Replace the single-asset logic with a dictionary-based system to support strategies on one or multiple assets.
3. Decouple data loading from the execution logic
4. Translate all docstrings, comments and variables to English.