Make userdata subdirectories and files accessible to retrieve workflow

### Feature Idea

simply change `app/user_manager.py`
`@routes.get("/userdata/{file}")`
to
`@routes.get("/userdata/{file:.*}")`

to get http://localhost:8188/userdata/workflows/video_wan2_2_14B_t2v-test.json

### Existing Solutions

`sed -i 's|/userdata/{file}|/userdata/{file:.*}|g' app/user_manager.py`

### Other

_No response_