feat: add Doubao Seedance 2.0 Mini model

[analogpvt]

Adds the new Doubao/Dreamina Seedance 2.0 Mini video model (seedance-2-0-mini) under the ByteDance provider list, with its associated resolution/duration validations and pricing.

Summary by CodeRabbit

• New Features
  • Added Seedance 2.0 Mini to available video-generation models.
  • Updated supported options for sizes/durations, reference-guided generation, and acceptance of first/last frame inputs for this model.
  • Added seedance-2-0-mini pricing for 480p and 720p (with audio and video only).
• Bug Fixes
  • Improved validation and messaging for unsupported frame and reference inputs across Seedance 2.0 variants.
  • Refined resolution selection for Dreamina requests to better match the chosen output size.

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 9495e278-4223-444a-9926-0e63f7e73ae5

📥 Commits

Reviewing files that changed from the base of the PR and between 72018e0 and 2571c72.

📒 Files selected for processing (2)

• apps/docs/content/features/video-generation.mdx
• apps/gateway/src/videos/videos.ts

Walkthrough

Adds seedance-2-0-mini as a ByteDance video model, updates gateway Seedance 2.0 routing and input checks, and refreshes the video-generation documentation with the new model’s capabilities and pricing.

Changes

Seedance 2.0 Mini model addition

Layer / File(s)	Summary
Model definition packages/models/src/models/bytedance.ts	Adds the seedance-2-0-mini model entry with provider ID, release date, pricing, supported sizes and durations, and capability flags.
Gateway Seedance 2.0 handling apps/gateway/src/videos/videos.ts	Extends Seedance 2.0 detection to include the mini provider ID, updates frame/reference unsupported-input messages, and changes Dreamina resolution mapping from video size resolution.
Documentation update apps/docs/content/features/video-generation.mdx	Adds the model to the available list, updates sizes/durations, frame-input scope, omni-reference wording, and pricing rows.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• theopenco/llmgateway#2270: Introduced earlier ByteDance Seedance model support in bytedance.ts and videos.ts, which this PR extends with the mini variant.
• theopenco/llmgateway#2538: Added Seedance 2.0 reference input handling in videos.ts and related docs, overlapping with the constraint updates here.
• theopenco/llmgateway#2699: Updated Seedance 2.0 frame input gating in videos.ts, which this PR expands to include seedance-2-0-mini.

Suggested reviewers: smakosh

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding the Doubao Seedance 2.0 Mini model.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@apps/docs/content/features/video-generation.mdx`:
- Line 16: The video-generation docs currently group seedance-2-0-mini with the
720p/1080p 5/10 profile, but its actual capability differs. Update the
capability table in the video generation docs to split Seedance 2.0 Mini into
its own row using the correct model mapping from the bytedance/seedance-2-0-mini
entry, and keep Seedance 2.0, Seedance 2.0 Fast, and Seedance 1.5 Pro in the
existing row with the shared resolution/duration profile.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 24f8083d-3a0f-46f8-9242-574de911ac97

📥 Commits

Reviewing files that changed from the base of the PR and between dce6db1 and b20feb9.

📒 Files selected for processing (3)

• apps/docs/content/features/video-generation.mdx
• apps/gateway/src/videos/videos.ts
• packages/models/src/models/bytedance.ts