Also run migrations on queue database in stress test

The steady_queue tables live on the queue database, not the default one.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: knifecake

tests/stress_test.py

@@ -418,6 +418,7 @@ def main():
     from django.core.management import call_command
 
     call_command("migrate", "--run-syncdb", verbosity=0)
+    call_command("migrate", "--run-syncdb", "--database", "queue", verbosity=0)
 
     # Setup
     ensure_counter_table()