Add built-in Cloud video template fallback

src/routes/money_printer.rs

@@ -723,6 +723,25 @@ fn workflow_prompt_from_graph(graph: &Value) -> Value {
         .unwrap_or_else(|| graph.clone())
 }
 
+fn default_cloud_seedance_prompt() -> Value {
+    json!({
+        "1": {
+            "class_type": "ByteDanceTextToVideoNode",
+            "inputs": {
+                "model": "seedance-1-0-lite-t2v-250428",
+                "prompt": "A clean vertical product demo video, minimal futuristic interface, smooth camera movement, bright studio lighting",
+                "resolution": "480p",
+                "aspect_ratio": "9:16",
+                "duration": 5,
+                "seed": 0,
+                "camera_fixed": false,
+                "watermark": false,
+                "generate_audio": false
+            }
+        }
+    })
+}
+
 async fn workflow_prompt_from_body(
     state: &AppState,
     auth: &MoneyPrinterAuth,
@@ -747,8 +766,11 @@ async fn workflow_prompt_from_body(
         .await?;
         return Ok(workflow_prompt_from_graph(&workflow.graph));
     }
+    if state.config.comfyui.uses_cloud_backend() {
+        return Ok(default_cloud_seedance_prompt());
+    }
     Err(AppError::BadRequest(
-        "Comfy API 模式需要选择真实 Comfy/Cloud 视频工作流模板，不能使用 BoosAPI 自定义节点".into(),
+        "Comfy API 模式需要选择真实 Comfy/Cloud 视频工作流模板；Cloud 模式可使用内置 Seedance 兜底模板".into(),
     ))
 }
 
@@ -856,11 +878,45 @@ fn inject_comfy_video_inputs(prompt: &mut Value, mapping: &Value, body: &Value,
 }
 
 fn repair_money_printer_comfy_prompt(prompt: &mut Value) {
+    repair_bytedance_video_nodes(prompt);
     repair_resize_image_mask_nodes(prompt);
     repair_text_generate_ltx2_prompt_nodes(prompt);
     repair_wan2_api_nodes(prompt);
 }
 
+fn repair_bytedance_video_nodes(prompt: &mut Value) {
+    let Some(nodes) = prompt.as_object_mut() else {
+        return;
+    };
+    for (_node_id, node) in nodes.iter_mut() {
+        let class_type = node.get("class_type").and_then(Value::as_str).unwrap_or_default();
+        if !matches!(class_type, "ByteDanceTextToVideoNode" | "ByteDance2TextToVideoNode") {
+            continue;
+        }
+        let Some(inputs) = node.get_mut("inputs").and_then(Value::as_object_mut) else {
+            continue;
+        };
+        if let Some(duration) = inputs.get("duration").and_then(value_to_duration_seconds) {
+            inputs.insert("duration".to_string(), json!(duration.clamp(3, 12)));
+        }
+        if let Some(duration) = inputs.get("model.duration").and_then(value_to_duration_seconds) {
+            inputs.insert("model.duration".to_string(), json!(duration.clamp(4, 15)));
+        }
+        if inputs
+            .get("resolution")
+            .is_some_and(|value| !matches!(value.as_str(), Some("480p" | "720p" | "1080p")))
+        {
+            inputs.insert("resolution".to_string(), json!("480p"));
+        }
+        if inputs
+            .get("aspect_ratio")
+            .is_some_and(|value| !matches!(value.as_str(), Some("16:9" | "4:3" | "1:1" | "3:4" | "9:16" | "21:9")))
+        {
+            inputs.insert("aspect_ratio".to_string(), json!("9:16"));
+        }
+    }
+}
+
 fn repair_resize_image_mask_nodes(prompt: &mut Value) {
     let Some(nodes) = prompt.as_object_mut() else {
         return;

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>