feat: add bytedance/seedance-2.0[-fast] (T2V/I2V/R2V, 6 endpoints)

[nosuchperson]

Register ByteDance Seedance 2.0 video generation models under a new bytedance/ vendor namespace:

bytedance/seedance-2.0/text-to-video
bytedance/seedance-2.0/image-to-video
bytedance/seedance-2.0/reference-to-video
bytedance/seedance-2.0-fast/text-to-video
bytedance/seedance-2.0-fast/image-to-video
bytedance/seedance-2.0-fast/reference-to-video

URL convention: /vendors/bytedance/v1/<model>/<operation>/generation (mule-router canonical after the muledance→seedance migration). Polling reuses the existing ${apiPath}/${taskId} pattern.

Parameter schemas extracted directly from
mule-router/tasks/handlers/mule/models/payloads/seedance.py:

• T2V: prompt (req), resolution, aspect_ratio, duration, generate_audio, seed, web_search, camera_fixed (std only), watermark (std only)
• I2V: image (req), last_frame_image, prompt, resolution, ...
• R2V: prompt, images[], videos[] (https-only), audios[], resolution, ...

Std vs fast differs in: resolution (std accepts 1080p, fast does not); T2V fast omits camera_fixed / watermark (server rejects non-false).

The model request-body field is auto-injected by mule-router's payload_transformer and is intentionally NOT exposed as a CLI flag.

Also:

• Add last_frame_image to IMAGE_PARAM_NAMES so seedance I2V local file paths get auto-converted to base64.
• Bump @mulerouter/core and mulerouter to 0.4.0 (publish workflow verifies the two versions match).

[Copilot]

Pull request overview

Registers ByteDance Seedance 2.0 video-generation models in @mulerouter/core under a new bytedance/ vendor namespace, enabling the CLI to resolve and run 6 new T2V/I2V/R2V endpoints (std + fast) using the canonical /vendors/bytedance/v1/<model>/<operation>/generation URL convention.

Changes:

• Added 6 new model endpoints for bytedance/seedance-2.0 and bytedance/seedance-2.0-fast (text/image/reference-to-video) with shared parameter builders.
• Updated image path auto-conversion to include last_frame_image so local file paths are base64-encoded automatically.
• Expanded test coverage for bytedance registration + CLI endpoint resolution, and bumped package versions to 0.4.0.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/core/tests/models.test.ts	Adds provider + endpoint registration assertions for ByteDance, updates expected totals.
packages/core/src/models/index.ts	Imports the new bytedance vendor module so endpoints register at load time.
packages/core/src/models/bytedance/_builders.ts	Centralizes Seedance parameter schemas and std/fast differences.
packages/core/src/models/bytedance/index.ts	Side-effect imports to register all 6 Seedance endpoints.
packages/core/src/models/bytedance/seedance-2.0-*.ts	Registers the 3 std Seedance endpoints with correct apiPath/resultKey/params.
packages/core/src/models/bytedance/seedance-2.0-fast-*.ts	Registers the 3 fast endpoints, omitting std-only params and restricting resolution enum.
packages/core/src/image.ts	Adds last_frame_image to auto base64 conversion parameter names.
packages/core/package.json	Bumps @mulerouter/core version to 0.4.0.
packages/cli/tests/run.test.ts	Adds tests ensuring 3-part identifier resolution and std vs fast distinction for Seedance.
packages/cli/package.json	Bumps CLI version to 0.4.0.

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