Wake the scheduler on plan and dinner changes (MQ-177-01)

A swap, stored draft, or dinner method/minutes change (edit or grounding)
now calls Scheduler.Wake once committed, so a crock-pot dinner swapped in
for tonight is reminded at start_by minus 15 minutes rather than at the
next hourly pass. Adds a fake-clock test that swaps in a crock-pot
Quest-log dinner at 09:01 and asserts the start reminder at 09:15, once.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/shopping/shopping_test.go

@@ -516,7 +516,7 @@ func TestGenerateManualRecipe(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	dsvc, err := dinners.NewService(e.st, grounder, runner, logger)
+	dsvc, err := dinners.NewService(e.st, grounder, runner, func() {}, logger)
 	if err != nil {
 		t.Fatal(err)
 	}