feat: 对接 generateVideo 页面后端接口

- 新增 uploadFile 工具函数用于图片上传
- 更新 useTemplateActions hook 使用 handleError 统一错误处理
- 实现 generateVideo 页面视频生成功能
  - 根据 formSchema.startNodes 动态构建请求数据
  - 支持图片和文本输入
  - 添加 loading 状态和错误提示
  - 生成成功后显示通知并返回

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

lib/uploadFile.ts

@@ -0,0 +1,25 @@
+import { root } from '@repo/core'
+import { FileController } from '@repo/sdk'
+import { Platform } from 'react-native'
+
+import { handleError } from '@/hooks/use-error'
+
+export async function uploadFile(params: { uri: string; mimeType?: string; fileName?: string }): Promise<string> {
+  const { uri, mimeType, fileName } = params
+  const file = {
+    name: fileName || 'uploaded_file.jpg',
+    type: mimeType || 'image/jpeg',
+    uri: Platform.OS === 'android' ? uri : uri.replace('file://', ''),
+  }
+  const formData = new FormData()
+  formData.append('file', file as any)
+
+  const fileController = root.get(FileController)
+  const { data, error } = await handleError(async () => await fileController.uploadS3(formData))
+
+  if (error || !data?.data) {
+    throw error || new Error('上传失败')
+  }
+
+  return data.data
+}