refactor: integrate Alembic, restructure project, and clean up
- Add Alembic configuration (alembic.ini, env.py) for database migrations - Remove legacy wheel.db and unnecessary __pycache__ files - Delete models.py to separate SQLAlchemy and Pydantic concerns - Restructure main.py to use modular API routers (user/admin) - Introduce config backend for centralized settings management
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