feat(tests): make Expected Detection editable when creating a test from template

Leads can now edit Expected Detection in the create-from-template
form, same as Suggested Attack Procedure — the edit seeds the new
test's detect_procedure via a detect_procedure_override, without
touching the template itself. The template only updates later through
the existing procedure-suggestion approval flow, once a round is
actually submitted — same mechanism as the red side, no new bypass.

backend/app/routers/tests.py

@@ -402,6 +402,7 @@ def create_test_from_template(
             platform_override=payload.platform,
             procedure_text_override=payload.procedure_text,
             tool_used_override=payload.tool_used,
+            detect_procedure_override=payload.detect_procedure,
         )
         # Call log_action()
         log_action(