feat: add Brainiall LLM Gateway model provider plugin

[fasuizu-br]

Plugin Submission Form

1. Metadata

• Plugin Author: brainiall
• Plugin Name: brainiall
• Repository URL: https://github.com/fasuizu-br/dify-brainiall-plugin

2. Submission Type

• New plugin submission
• Version update for existing plugin

3. Description

Brainiall LLM Gateway provides access to 113+ AI models from 17 providers (Claude, DeepSeek, Llama, Qwen, Nova, Mistral, and more) through a single OpenAI-compatible API endpoint powered by AWS Bedrock.

Key features:

• 12 predefined models with accurate pricing (Claude Opus/Sonnet/Haiku, DeepSeek R1/V3, Llama 3.3/4, Qwen 3, Mistral Large 3, Amazon Nova Pro/Micro)
• Customizable model support for all 113+ models in the catalog
• Streaming responses
• Function calling / tool use support
• Vision support (Claude, Nova Pro, Mistral Large 3, Llama 4 Scout)
• Competitive pricing via AWS Bedrock

Plugin structure:

• Uses OAICompatLargeLanguageModel base class for OpenAI-compatible integration
• Provider credential validation via lightweight model call
• Both predefined and customizable model configurations
• Privacy policy included

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. All data is sent directly to the Brainiall LLM Gateway API, which proxies requests to AWS Bedrock. No data is stored or processed by the plugin itself.

Privacy Policy

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