fix(features): 功能开放 - 兼容历史系统代理任务并修正前端格式

backend/internal/service/feature_availability_test.go

@@ -89,6 +89,13 @@ func TestCustomChannelTaskInputRequiresFeature(t *testing.T) {
 	if err := svc.requireCustomChannelsForTaskInput(systemInput); err != nil {
 		t.Fatalf("system channel task error = %v", err)
 	}
+	legacySystemInput, err := normalizeTaskInput(map[string]any{"config": providerConfig{BaseURL: "/api/ai/system/system-1", APIKey: "system", Model: "text-model"}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := svc.requireCustomChannelsForTaskInput(legacySystemInput); err != nil {
+		t.Fatalf("legacy system proxy task error = %v", err)
+	}
 }
 
 func TestTaskBillingOrderSkipsPricingWhenCreditsDisabled(t *testing.T) {

backend/internal/service/service.go

@@ -416,7 +416,10 @@ func taskInputUsesCustomChannel(input map[string]any) bool {
 	channelID, _ := config["channelId"].(string)
 	baseURL, _ := config["baseUrl"].(string)
 	apiKey, _ := config["apiKey"].(string)
-	return strings.TrimSpace(channelID) == "" && strings.TrimSpace(baseURL) != "" && strings.TrimSpace(apiKey) != ""
+	if strings.TrimSpace(channelID) != "" || systemChannelIDFromBaseURL(baseURL) != "" {
+		return false
+	}
+	return strings.TrimSpace(baseURL) != "" && strings.TrimSpace(apiKey) != ""
 }
 
 func compactPersistedValue(value interface{}) interface{} {