novita: fix Wan 2.7 R2V media item types to match upstream enum#9
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The Wan 2.7 R2V (`/v3/async/wan2.7-r2v`) endpoint requires each item
in the `media` array to carry a `type` value from the enum:
- `reference_image`
- `reference_video`
- `first_frame`
We were sending `image` and `video`, which Novita rejects with the
generic "failed to exec task" 500 — every R2V submission via the
playground / legacy `image_urls`+`video_urls` shape was failing
silently for that reason.
Two changes in `build_body`:
1. Repack each `image_urls[]` URL as `{type: "reference_image", url}`
and each `video_urls[]` URL as `{type: "reference_video", url}`.
No way to express `first_frame` or per-item `reference_voice`
from the legacy flat shape — callers who want those use the new
pass-through path below.
2. Pass `media` through the allowed-fields whitelist for the R2V
shape so direct API callers / a future media-editor UI can
submit the rich shape (`[{type, url, reference_voice?}, ...]`)
verbatim. The `!body.contains_key("media")` guard in the repack
block ensures the pass-through wins when both shapes are present.
Also cap the synthesised `media` array at 5 items to match Novita's
documented ceiling (combined images+videos ≤ 5), so users who upload
more get a deterministic truncate-from-front rather than a 422.
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Summary
{type:"image"|"video"}in eachmedia[]item; Novita's enum isreference_image | reference_video | first_frame. Upstream rejected every R2V request with "failed to exec task".reference_image/reference_videofrom the legacy flatimage_urls+video_urlsshape.mediaadded to the R2V allowed-fields whitelist so direct API callers can submit the rich shape (includingfirst_frameand per-itemreference_voice) verbatim. The repack block is skipped whenmediais already present.mediaarray truncated at 5 to match Novita's combined-items cap.Test plan
image_urls+video_urlsflow) and confirm Novita accepts the call (status moves pastfailed to exec task).media: [{type:"first_frame", url}, ...]body and confirm pass-through.