add doubao seedream plugin

[stevenup]

Plugin Submission Form

1. Metadata

• Plugin Author: leo-digital
• Plugin Name: doubao-seedream
• Repository URL: https://github.com/leo-digital/doubao-seedream

2. Submission Type

• New plugin submission
• Version update for existing plugin

3. Description

This plugin integrates the Seedream V4.5 model provided by Volcengine, empowering Dify users with robust image generation capabilities that include the following features:

• Text-to-Image: Generate high-definition images based on precise text prompts.
• Image-to-Image: Support the generation mode that combines reference images with customized text prompts.
• Batch Image Generation: Enable one-click generation of multiple coherent images, with a maximum output of 15 images per batch.
• High Customization: Support 2K and 4K resolutions as well as custom aspect ratios, while being fully compatible with all official parameter configurations for more flexible and personalized adjustments.
• Custom API Base URL: Allow users to set a custom base URL to request Seedream API.

4. Checklist

• I have read and followed the Publish to Dify Marketplace guidelines
• I have read and comply with the Plugin Developer Agreement
• I confirm my plugin works properly on both Dify Community Edition and Cloud Version
• I confirm my plugin has been thoroughly tested for completeness and functionality
• My plugin brings new value to Dify

5. Documentation Checklist

• Step-by-step setup instructions
• Detailed usage instructions
• All required APIs and credentials are clearly listed
• Connection requirements and configuration details
• Link to the repository for the plugin source code

6. Privacy Protection Information

Data Collection

This plugin does not collect any user personal data. It only processes the prompts and image data provided by users and sends them to the Volcengine Ark API for image generation. All API credentials (Ark API Key) are securely configured by users on the Dify platform and are used solely for identity authentication purposes.

Privacy Policy

• I confirm that I have prepared and included a privacy policy in my plugin package based on the Plugin Privacy Protection Guidelines