Support ByteDance Seedance 2.5 Model

### Feature Idea

ByteDance recently released the **Seedance 2.5** video generation model. It brings major upgrades compared to previous versions, including:
- **30-second single-pass video generation** at native high resolution.
- **Up to 50 multimodal reference inputs** (images, video clips, and audio guidance).
- **Enhanced temporal consistency** and region-level video editing capabilities.

Currently, ComfyUI users lack official native/API node support for Seedance 2.5 to build modular video workflows.

### Describe the solution you'd like
I would like to request integration/support for **Seedance 2.5** in ComfyUI:
1. **Nodes support**: Dedicated nodes (or updated API nodes) for Seedance 2.5 Text-to-Video, Image-to-Video, and Multimodal Video generation.
2. **Parameter controls**: Expose key parameters like 30s duration, resolution/aspect ratio, audio sync, and multi-reference inputs.
3. **Example Workflows**: Provide a basic workflow template in ComfyUI to help users get started quickly.

### Existing Solutions

_No response_

### Other

_No response_

Start by reviewing ComfyUI's existing API-node integrations and confirm the available Seedance 2.5 API and supported inputs. Identify the appropriate entry points for text-to-video, image-to-video, multimodal references, parameter controls, and example workflows. Done means the requested generation modes, controls, and a basic workflow are supported and usable.

Written by the indexing model from the issue text.