Fix remaining clippy errors: restore Duration import, fix test assertion syntax

.a0proj/memory/index.faiss.sha256

@@ -1 +1 @@
-cbc260986899e0e958e5c3f9343194a1edf738ae20b8b73fe42ec09e5ac4cd6c
+79624d8726f0d5ea6c244d5c5ca540c302840c4d5285a5fb9806636b6caca299

src/auth/mtls.rs

@@ -7,7 +7,7 @@ use actix_web::{
     dev::{forward_ready, Service, ServiceRequest, ServiceResponse, Transform},
     Error, HttpMessage,
 };
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, Duration, Utc};
 use futures_util::future::LocalBoxFuture;
 use rustls::{
     server::{ServerConfig, WebPkiClientVerifier},

src/packages/mod.rs

@@ -499,10 +499,10 @@ mod tests {
     #[test]
     fn test_apt_backend_creation() {
         let _backend = AptBackend::new();
-        #[allow(clippy::assertions_on_constants)]
+        // Test passes if backend creation doesn't panic
-        assert!(true); // Test passes - backend creation successful
     }
 
+
     #[test]
     fn test_package_status_serialization() {
         let status = PackageStatus::Installed;