Remove unused imports across multiple modules

Cleaned up various files by removing unused or redundant import statements to improve code readability and reduce potential confusion. No functional changes were made.

src/person_info/person_info.py

@@ -7,7 +7,6 @@ from json_repair import repair_json
 from typing import Any, Callable, Dict, Union, Optional
 from sqlalchemy import select
 from src.common.logger import get_logger
-from src.common.database.database import db
 from src.common.database.sqlalchemy_models import PersonInfo
 from src.common.database.sqlalchemy_database_api import get_db_session
 from src.llm_models.utils_model import LLMRequest