MiniMax H3 Reference to Video: input labels are 0-based while prompt references are 1-based

### Feature Idea

In `MiniMax H3 Reference to Video`, the reference inputs are shown as:

* `ref_image_0`
* `ref_video_0`
* `ref_audio_0`

while H3 prompt references start from 1:

* ``
* ``
* ``

So, for example, `ref_image_0` corresponds to ``.

I understand that 0-based indexing internally is completely normal, but since this is an H3-specific node, would it make sense for the user-facing labels to follow the numbering used in H3 prompts?

The current mismatch is easy to misread, especially when using multiple references.

### Existing Solutions

_No response_

### Other

_No response_

Start at the MiniMax H3 Reference to Video node and inspect where the ref_image_0, ref_video_0, and ref_audio_0 input labels are defined. Update the user-facing numbering to match the H3 prompt references, then verify that multiple references display consistently and that the existing node behavior is unchanged.

Written by the indexing model from the issue text.