Service & Repository Layer에 대한 logging (aop) 추가

[rll2641]

:메모: 작업 내용

• FastAPI에서 의존성 주입을 활용한 AOP 기반 계층별 로깅 시스템 구현
• Request → LoggingMiddleware → ServiceDependency / RepositoryDependency → Endpoint

라우터 예시
@router.post("/search")
async def vector_search(
    query: str,
    top_k: int = 10,
    request: Request = None,
    _: None = Depends(vector_db_dependency),
    __: None = Depends(log_repository_response)
):

실행 결과 
2025-08-26 23:58:43.036 | INFO     | app.middleware.logging:dispatch:21 - [REQUEST_START] trace_id=abd9c35d method=POST url=/chunk ip=127.0.0.1
2025-08-26 23:58:43.037 | INFO     | app.config.logging.ServiceLoggerDependency:__call__:32 - [CHUNKING_START] trace_id=NO_TRACE_ID text=my name is jihoon chunk_size=100 overlap=20
2025-08-26 23:58:43.037 | INFO     | app.config.logging.ServiceLoggerDependency:log_service_response:83 - [CHUNKING_SUCCESS] trace_id=NO_TRACE_ID execution_time=0.0004s text=my name is jihoon chunk_size=100 overlap=20
2025-08-26 23:58:43.038 | INFO     | app.middleware.logging:dispatch:31 - [REQUEST_SUCCESS] trace_id=abd9c35d method=POST url=/chunk status=200 time=0.0013s