强制启用文件拆分（实际模型忽略）

internal/httpapi/admin/handler_settings_test.go

@@ -189,8 +189,8 @@ func TestUpdateSettingsHistorySplit(t *testing.T) {
 		t.Fatalf("expected 200, got %d body=%s", rec.Code, rec.Body.String())
 	}
 	snap := h.Store.Snapshot()
-	if snap.HistorySplit.Enabled == nil || *snap.HistorySplit.Enabled {
-		t.Fatalf("expected history_split.enabled=false, got %#v", snap.HistorySplit.Enabled)
+	if snap.HistorySplit.Enabled == nil || !*snap.HistorySplit.Enabled {
+		t.Fatalf("expected history_split.enabled to be forced true, got %#v", snap.HistorySplit.Enabled)
 	}
 	if snap.HistorySplit.TriggerAfterTurns == nil || *snap.HistorySplit.TriggerAfterTurns != 3 {
 		t.Fatalf("expected history_split.trigger_after_turns=3, got %#v", snap.HistorySplit.TriggerAfterTurns)

internal/httpapi/admin/settings/handler_settings_parse.go

@@ -152,10 +152,8 @@ func parseSettingsUpdateRequest(req map[string]any) (*config.AdminConfig, *confi
 
 	if raw, ok := req["history_split"].(map[string]any); ok {
 		cfg := &config.HistorySplitConfig{}
-		if v, exists := raw["enabled"]; exists {
-			b := boolFrom(v)
-			cfg.Enabled = &b
-		}
+		enabled := true
+		cfg.Enabled = &enabled
 		if v, exists := raw["trigger_after_turns"]; exists {
 			n := intFrom(v)
 			if err := config.ValidateIntRange("history_split.trigger_after_turns", n, 1, 1000, true); err != nil {

internal/httpapi/openai/history/history_split.go

@@ -27,9 +27,6 @@ func (s Service) Apply(ctx context.Context, a *auth.RequestAuth, stdReq promptco
 	if s.DS == nil || s.Store == nil || a == nil {
 		return stdReq, nil
 	}
-	if !s.Store.HistorySplitEnabled() {
-		return stdReq, nil
-	}
 
 	promptMessages, historyMessages := SplitOpenAIHistoryMessages(stdReq.Messages, s.Store.HistorySplitTriggerAfterTurns())
 	if len(historyMessages) == 0 {