fix: jimeng i2v support multi image by metadata

[feitianbubu]

即梦视频matadata透传图片参数支持识别图生视频和首尾生视频

Summary by CodeRabbit

• Refactor

  • Improved image processing logic to better manage single and multi-image handling across different scenarios.
  • Streamlined image input detection and routing.

• Chores

  • Updated dependencies to support enhanced functionality.

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[coderabbitai]

Walkthrough

Modified jimeng adaptor's image-handling logic to consolidate image length calculations across three sources (req.Images, r.BinaryDataBase64, r.ImageUrls) into a single imageLen variable, simplifying conditional branching for single vs. multi-image request routing.

Changes

Cohort / File(s)	Summary
Image length consolidation relay/channel/task/jimeng/adaptor.go	Introduced imageLen computed as max of three image source lengths; replaced individual len(req.Images) checks with imageLen in branching logic for single vs. multi-image paths; added lo dependency

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• 修复即梦v30-pro视频生成失败问题 #2167 — Modifies the same convertToRequestPayload function's image-count branching logic.
• feat: jimeng use openai sdk input_reference i2v #2029 — Changes image-selection branching in the same adaptor function based on image count.
• fix: trim suffix p for jimeng image model #2168 — Affects the multi-image vs. single-image request paths in jimeng adaptor.

Suggested reviewers

• creamlike1024
• seefs001

Poem

🐰 Three sources merge into one,
imageLen dances in the sun,
Branches simplified with grace,
A cleaner jimeng adaptor space! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly addresses the main change: adding multi-image support to jimeng i2v via metadata parameter handling. It accurately reflects the primary objective of the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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