feat: Add DeepSeek AI provider support to Eliza

[daizhengxue]

Relates to

Add DeepSeek AI provider support to Eliza

Risks

Low - Adding a new model provider with OpenAI-compatible API format

Background

DeepSeek is a leading AI model provider offering high-performance language models with OpenAI-compatible API format. Their models are known for:

• Strong performance in coding and general tasks
• Cost-effective pricing
• OpenAI-compatible API format for easy integration

What does this PR do?

• Adds DeepSeek AI as a new model provider：https://api-docs.deepseek.com/
• Implements DeepSeek chat completion API integration
• Adds configuration support for DeepSeek API key and models
• Adds environment variables for DeepSeek configuration

What kind of change is this?

Features (non-breaking change which adds functionality)

Documentation changes needed?

My changes require a change to the project documentation.

• Add DeepSeek configuration to environment variables documentation
• Add DeepSeek provider setup instructions

Testing

Where should a reviewer start?

1. packages/core/src/types.ts - Added DeepSeek to ModelProviderName
2. packages/core/src/models.ts - Added DeepSeek model configuration
3. packages/core/src/generation.ts - Added DeepSeek provider implementation

Detailed testing steps

1. Set DEEPSEEK_API_KEY in .env
2. Configure a character to use "deepseek" as modelProvider
3. Start the agent and verify chat completion works
4. Verify different model classes (SMALL, MEDIUM, LARGE) work correctly

Deploy Notes

New environment variables needed:

• DEEPSEEK_API_KEY
• DEEPSEEK_API_URL (optional)
• SMALL_DEEPSEEK_MODEL (optional)
• MEDIUM_DEEPSEEK_MODEL (optional)
• LARGE_DEEPSEEK_MODEL (optional)

[daizhengxue]

thx

[daizhengxue]

Sorry guys. I missed the API key input.
I fix it in this repo.
#2186