fix canvas agent defaults and video billing

components/canvas/CanvasChatPanel.tsx

@@ -2946,10 +2946,8 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
   // 默认选择模型（根据系统设置）
   useEffect(() => {
     if (!selectedModelId && siteSettings) {
-      // 使用系统设置的默认模型，如果没有设置则使用Agent模式
-      const defaultModel = siteSettings.canvasDefaultModelId || "auto";
-      currentModelIdRef.current = defaultModel;
-      setSelectedModelId(defaultModel);
+      currentModelIdRef.current = "auto";
+      setSelectedModelId("auto");
     }
   }, [selectedModelId, siteSettings]);
 
@@ -8850,6 +8848,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
                     inline={true}
                     providerType={currentModel?.providerType}
                     imageGenConfig={currentModel?.imageGenConfig || undefined}
+                    hideImageCount={activeComposerMode === "agent"}
                     hideAdvancedOptions={activeComposerMode === "image"}
                   />
                 </div>

lib/ai/tools/generate-video.ts

@@ -430,6 +430,9 @@ export function generateVideo({ dataStream }: { dataStream: any }) {
           success: true,
           videoUrl: result.videoUrl,
           metadata: result.metadata,
+          modelDisplayName: result.modelDisplayName,
+          modelId: result.modelId,
+          modelRef: result.modelRef,
         };
       } catch (error: any) {
         console.error("[Generate Video Tool] ❌ 生成失败:", error);