Fix: Settings object should be directly used

[Parth971]

In core/app.py file, we are creating settings object again like

from core.config import Settings
settings = Settings()
kit = FastAppKit(settings=settings)
app = kit.create_app()

But instead, we should directly inport settings from config like

from core.config import settings
kit = FastAppKit(settings=settings)
app = kit.create_app()

Because it's already created object in core/config.py like

# Global settings instance
settings = Settings()

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Same issues in

• core/app.py
• tests/test_config.py
• core/db/migrations/env.py