feat(logs): every VM operation writes an audit row the VM's Logs tab finds by UUID

Operations on a VM now write their rows the way the admin audit does: one
row per operation, done or failed with a safe reason, with the user, IP and
host. Each row names the VM ("VM web-1: delete snapshot snap1") and carries
its UUID in the new Logs.instance_uuid column.

- audit_vm and failed_vm wrap audit() and failed() for a VM. A failure the
  view turns into a message is caught outside the block, so its failed row
  is written; busy claims, permission and quota refusals and invalid input
  write nothing. No password, key or XML goes into a row.
- All VM page operations move from addlogmsg to audit_vm, and addlogmsg
  goes. QoS changes and defining a VM from XML are logged now; a gstfsd
  error reply (root password, SSH key) is a failed row, not a done one.
- Partial results are rows of their own: the VM delete, then each disk
  delete; the disk detach, then the volume delete; the migration, then a
  failed autostart restore, NVRAM removal or record on the target.
- Migration rows use the compute name as the host column, as every other
  row does.
- VM job rows (create, clone, snapshots) and their resolutions carry the
  VM's UUID; snapshot job intents now record it. The owner rows of the VM
  page and the accounts pages, and the ownership system rows, carry it too.
- The Logs tab loads vm_logs/<pk>/ and shows the rows with the VM's UUID,
  so a rename keeps the history, two VMs with one name are told apart and
  a VM on two computes is one VM. It gains a Result column. Rows from
  before this change have no UUID and stay on the Logs page only.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

instances/tests/test_audit_rows.py

@@ -33,11 +33,11 @@ class VMOwnerRowTests(TestCase):
         ui = UserInstance.objects.get(user=self.bob)
         self.client.post(reverse("instances:del_owner", args=[self.vm.pk]), {"userinstance": ui.pk})
         self.assertEqual(rows(), [
-            ("VM vm owner bob: add", True),
-            ("VM vm owner carol: add: only one owner is allowed", False),
-            ("VM vm owner bob: remove", True),
+            ("VM vm: add owner bob", True),
+            ("VM vm: add owner carol: only one owner is allowed", False),
+            ("VM vm: remove owner bob", True),
         ])
-        shown = [log["message"] for log in self.client.get(reverse("vm_logs", args=["vm"])).json()]
+        shown = [log["message"] for log in self.client.get(reverse("vm_logs", args=[self.vm.pk])).json()]
         self.assertCountEqual(shown, [m for m, _ in rows()])