Add built-in Cloud video template fallback

src/web/pages/MoneyPrinter.tsx

@@ -224,6 +224,8 @@ function parseJsonInput(value: string, label: string) {
   }
 }
 
+const BUILTIN_CLOUD_TEMPLATE_VALUE = '__builtin_cloud_seedance__';
+
 export default function MoneyPrinter() {
   const location = useLocation();
   const audience: SessionAudience = location.pathname.startsWith('/user/') ? 'user' : 'admin';
@@ -271,15 +273,21 @@ export default function MoneyPrinter() {
   }, [loadJobs, loadWorkflows]);
 
   const selectedWorkflow = workflows.find((item) => item.publicId === templateId) || null;
-  const canSubmit = Boolean(topic.trim()) && !submitting && (videoBackend !== 'comfy' || Boolean(templateId));
+  const useBuiltinCloudTemplate = videoBackend === 'comfy' && (!templateId || templateId === BUILTIN_CLOUD_TEMPLATE_VALUE);
+  const canSubmit = Boolean(topic.trim()) && !submitting;
 
   useEffect(() => {
+    if (useBuiltinCloudTemplate) {
+      setComfyPrompt('');
+      setComfyNodeMapping('{\n  "prompt": { "nodeId": "1", "field": "prompt" },\n  "ratio": { "nodeId": "1", "field": "aspect_ratio" },\n  "resolution": { "nodeId": "1", "field": "resolution" },\n  "duration": { "nodeId": "1", "field": "duration" }\n}');
+      return;
+    }
     if (!selectedWorkflow || videoBackend !== 'comfy') return;
     const prompt = workflowPromptFromGraph(selectedWorkflow.graph);
     if (prompt) setComfyPrompt(JSON.stringify(prompt, null, 2));
     const mapping = mappingFromGraph(selectedWorkflow.graph);
     setComfyNodeMapping(JSON.stringify(mapping || inferMappingFromPrompt(prompt), null, 2));
-  }, [selectedWorkflow?.publicId, videoBackend]);
+  }, [selectedWorkflow?.publicId, videoBackend, useBuiltinCloudTemplate]);
 
   useEffect(() => {
     if (!jobs.some((job) => !terminal(job.status))) return;
@@ -309,8 +317,8 @@ export default function MoneyPrinter() {
         requirements,
         language: '中文',
         ...(videoBackend === 'comfy' ? {
-          templateId: templateId || undefined,
-          comfyPrompt: parseJsonInput(comfyPrompt, 'Comfy prompt JSON'),
+          templateId: useBuiltinCloudTemplate ? undefined : templateId,
+          comfyPrompt: useBuiltinCloudTemplate ? undefined : parseJsonInput(comfyPrompt, 'Comfy prompt JSON'),
           comfyNodeMapping: parseJsonInput(comfyNodeMapping, '节点映射 JSON'),
         } : {}),
       });
@@ -450,7 +458,7 @@ export default function MoneyPrinter() {
               <label className="money-printer-field">
                 <span>工作流模板</span>
                 <select value={templateId} onChange={(event) => setTemplateId(event.target.value)}>
-                  <option value="">请选择模板</option>
+                  <option value={BUILTIN_CLOUD_TEMPLATE_VALUE}>内置 Cloud Seedance 文生视频</option>
                   {workflows.map((workflow) => (
                     <option key={workflow.publicId} value={workflow.publicId}>
                       {workflowLooksVideoCapable(workflow) ? '视频 · ' : '模板 · '}{workflowOptionLabel(workflow)}
@@ -458,7 +466,12 @@ export default function MoneyPrinter() {
                   ))}
                 </select>
               </label>
-              {selectedWorkflow ? (
+              {useBuiltinCloudTemplate ? (
+                <div className="money-printer-template-meta">
+                  <strong>内置 Cloud Seedance 文生视频</strong>
+                  <span>无需导入模板，使用 Comfy Cloud 官方 ByteDanceTextToVideoNode。若账号无余额，会直接显示余额不足。</span>
+                </div>
+              ) : selectedWorkflow ? (
                 <div className="money-printer-template-meta">
                   <strong>{selectedWorkflow.name}</strong>
                   <span>