🐛 fix: 修复 template run 数据格式与 identifier 缺失问题

主要修复：
1. ✅ 添加 transformFormDataToRunFormat 函数转换表单数据
2. ✅ 根据节点类型正确格式化数据：
   - image: { images: [{ url: "..." }] }
   - video: { videos: [{ url: "..." }] }
   - text: { texts: ["..."] }
   - select: { selections: "..." } (单选) / ["..."] (多选)
3. ✅ 添加 identifier 字段到 API 请求
4. ✅ 从 storage 获取用户 session 作为 identifier

修复问题：
- ❌ 之前：{ "data": { "node_xxx": "blob:..." } }
- ✅ 现在：{ "data": { "node_xxx": { "images": [{ "url": "..." }] } }, "identifier": "user-id" }

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/templates/[id]/form.tsx

@@ -95,6 +95,62 @@ export default function TemplateFormScreen() {
     return Object.keys(newErrors).length === 0;
   };
 
+  const transformFormDataToRunFormat = (formData: Record<string, any>): Record<string, any> => {
+    if (!template?.formSchema?.startNodes) return {};
+
+    const transformed: Record<string, any> = {};
+
+    template.formSchema.startNodes.forEach((node: TemplateGraphNode) => {
+      const { id, type } = node;
+      const value = formData[id];
+
+      // 跳过空值
+      if (!value || (Array.isArray(value) && value.length === 0)) {
+        return;
+      }
+
+      // 根据节点类型转换数据格式
+      switch (type) {
+        case 'image':
+          transformed[id] = {
+            images: [{ url: value }],
+          };
+          break;
+
+        case 'video':
+          transformed[id] = {
+            videos: [{ url: value }],
+          };
+          break;
+
+        case 'text':
+          transformed[id] = {
+            texts: [value],
+          };
+          break;
+
+        case 'select':
+          // 根据 allowMultiple 判断是否为多选
+          if (node.data.actionData?.allowMultiple) {
+            transformed[id] = {
+              selections: Array.isArray(value) ? value : [value],
+            };
+          } else {
+            transformed[id] = {
+              selections: value,
+            };
+          }
+          break;
+
+        default:
+          // 未知类型，保持原样
+          transformed[id] = value;
+      }
+    });
+
+    return transformed;
+  };
+
   const handleSubmit = async () => {
     if (!template) return;
     if (!validateForm()) {
@@ -121,8 +177,11 @@ export default function TemplateFormScreen() {
         return;
       }
 
-      // 2. 调用 template run
-      const runResponse = await runTemplate(id, formData);
+      // 2. 转换表单数据为正确的 API 格式
+      const transformedData = transformFormDataToRunFormat(formData);
+
+      // 3. 调用 template run
+      const runResponse = await runTemplate(id, transformedData);
 
       if (!runResponse.success) {
         Alert.alert('错误', '生成任务创建失败');
@@ -131,7 +190,7 @@ export default function TemplateFormScreen() {
 
       const generationId = runResponse.data;
 
-      // 3. 跳转到结果页面
+      // 4. 跳转到结果页面
       Alert.alert('成功', '视频生成任务已创建', [
         {
           text: '查看结果',