fix: format + tracing

src/middlewares/auth/middleware.rs

@@ -41,7 +41,7 @@ pub async fn auth_middleware(mut request: Request, next: Next) -> Result<Respons
                     Ok(next.run(request).await)
                 }
                 Err(e) => {
-                    eprintln!("JWT validation failed: {:?}", e);
+                    tracing::error!("JWT validation failed: {:?}", e);
                     Err(StatusCode::UNAUTHORIZED)
                 }
             }