fix: resolve CI failures (fmt, clippy, tests)

- Fix rustfmt formatting in cache.rs, patches.rs, system.rs, routes.rs, main.rs
- Add Default impl for PackageCacheState (clippy new_without_default)
- Change apply_with_cache_retry generic bound from Fn to FnMut
- Add mut to refresh_fn parameter for FnMut compatibility
- Replace bool comparison with ! operator (clippy bool_comparison)
- Update todo.md with completed status

src/api/routes.rs

@@ -26,21 +26,24 @@ pub fn configure_api_routes(
 ) {
     info!("Configuring API v1 routes");
 
-    cfg.app_data(job_manager).app_data(backend).app_data(cache_state).service(
-        web::scope("/api/v1")
-            // VULN-005: Default handler for unsupported methods returns 405 instead of 404
-            .default_service(web::route().to(method_not_allowed))
-            // Package Management Endpoints
-            .configure(packages::configure_routes)
-            // Patch Management Endpoints
-            .configure(patches::configure_routes)
-            // System Management Endpoints
-            .configure(system::configure_routes)
-            // Job Management Endpoints
-            .configure(jobs::configure_routes)
-            // WebSocket Endpoint
-            .configure(websocket::configure_routes),
-    );
+    cfg.app_data(job_manager)
+        .app_data(backend)
+        .app_data(cache_state)
+        .service(
+            web::scope("/api/v1")
+                // VULN-005: Default handler for unsupported methods returns 405 instead of 404
+                .default_service(web::route().to(method_not_allowed))
+                // Package Management Endpoints
+                .configure(packages::configure_routes)
+                // Patch Management Endpoints
+                .configure(patches::configure_routes)
+                // System Management Endpoints
+                .configure(system::configure_routes)
+                // Job Management Endpoints
+                .configure(jobs::configure_routes)
+                // WebSocket Endpoint
+                .configure(websocket::configure_routes),
+        );
 }
 
 /// Health check route (outside API scope for load balancer checks)