Fix: Improve YOLO view function and SMS handling (#123)

[se7en-devOps]

Description
This PR updates bitnbuild/yolo/views.py to improve stability and maintainability.

Changes made:

1. Corrected typographical and formatting errors.
2. Refactored object detection loop by adding a frame capture check.
3. Moved YOLO model initialization outside the function for better efficiency.
   4.Fixed undefined variable issue in the SMS function (added print statement).

Why this is needed:

Prevents runtime errors if frame capture fails.

Reduces redundant YOLO model initialization overhead.

Improves code readability and reliability.