Refactor CLI: migrate to Rich, new main.py, improved typing & I/O

[DasKaroWow]

Changes:

• Replaced old project.py with a new main.py implementation.
• Integrated Rich for better CLI output (tables, prompts, colored messages, clear screen).
• Added type hints (Literal, explicit function signatures) for clarity and maintainability.
• Simplified input/output flow and removed os.system / time.sleep in favor of console.clear().
• Centralized constants and file paths for easier configuration.

Why
This refactor improves code readability, UX of the CLI, and overall maintainability while keeping functionality consistent.