fix: remove debug print statement and improve error handling in yolo_mapping.py

[ajithhraj]

yolo_mapping.py has two problems:

• Contains a debug print(os.getcwd()) statement that should not be in production code
• db_create_YOLO_classes_table has no exception handling — if SQLite fails, the error is silent

Proposed fix

• Remove the debug print and unused import os
• Add sqlite3.Error exception handling with proper logging
• Add success log message

I'd like to fix this if maintainers agree.

[github-actions]

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