Give the spam classifier test its own upload limits

The quota test, which runs earlier in the same system suite, leaves
uploads expiring after one second, at most three at a time, and the
spam classifier test inherited that. It imports twenty samples, each an
upload followed by an import; when the step between them takes longer
than a second, the import fails with BlobNotFound.

After the v0.16.25 merge this failed in two runs out of three, where
main passed three out of three. Putting back the old midnight rounding
of a training sample's deadline (upstream now uses now() + hold, which
is now() in this suite since the purge test holds samples for zero
seconds) made it pass, so that change is what tips the timing; exactly
how it slows the import loop wasn't traced.

The test now resets the upload TTL, count and quota to their defaults
before it starts. Production isn't affected: uploads are kept for an
hour by default and samples for ninety days.

tests/src/system/antispam.rs

@@ -2,6 +2,8 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::utils::{jmap::JmapUtils, server::TestServer};
@@ -11,8 +13,8 @@ use registry::{
         enums::{Permission, TaskSpamFilterMaintenanceType, TaskStoreMaintenanceType},
         prelude::{ObjectType, Property},
         structs::{
-            Permissions, PermissionsList, SpamTrainingSample, Task, TaskSpamFilterMaintenance,
-            TaskStatus, TaskStoreMaintenance,
+            Jmap, Permissions, PermissionsList, SpamTrainingSample, Task,
+            TaskSpamFilterMaintenance, TaskStatus, TaskStoreMaintenance,
         },
     },
     types::map::Map,
@@ -26,6 +28,21 @@ pub async fn test(test: &mut TestServer) {
 
     // Create test accounts
     let admin = test.account("[email protected]");
+
+    // inbuxa: the quota test leaves uploads expiring after one second, at
+    // most three at a time. This test imports twenty samples, and a debug
+    // build can take longer than that between upload and import.
+    admin
+        .registry_update_setting(
+            Jmap::default(),
+            &[
+                Property::UploadQuota,
+                Property::MaxUploadCount,
+                Property::UploadTtl,
+            ],
+        )
+        .await;
+    admin.reload_settings().await;
     let account = test
         .create_user_account(
             "[email protected]",