feat: add NEAR AI model provider

[think-in-universe]

Relates to

Add NEAR AI (https://near.ai) Inference API (OpenAI compatible) to Eliza: https://docs.near.ai/inference/

Risks

Low: adding a new OpenAI compatible model provider

Background

NEAR AI is building a truly open and user-owned AI, which provides agent hosting and inference services.

Driven by one of the minds behinds TensorFlow and the Transformer Architecture, NEAR AI puts you back in control. Your data stays yours, and your AI works for you, with no compromises on privacy or ownership.

What does this PR do?

• Adds NEAR AI as a new model provider：https://docs.near.ai/inference/
• Implements NEAR AI chat completion API integration
• Adds configuration support for NEAR AI API URL, login and models
• Adds environment variables for NEAR AI 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 NEAR AI configuration to environment variables documentation
• Add NEAR AI to model provider name

Testing

Where should a reviewer start?

1. packages/core/src/types.ts - Adds NEARAI to ModelProviderName
2. packages/core/src/models.ts - Adds NEARAI model configuration
3. packages/core/src/generation.ts - Adds NEARAI provider implementation (OpenAI compatible)

Detailed testing steps

1. Login with NEAR AI CLI (nearai login): https://docs.near.ai/agents/quickstart/
2. Configure a character to use "NEARAI" 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 added:

• NEARAI_API_URL (optional)
• NEARAI_API_KEY (optional if you login with NEAR AI CLI: nearai login)
• NEARAI_MODEL (optional)
• SMALL_NEARAI_MODEL (optional)
• MEDIUM_NEARAI_MODEL (optional)
• LARGE_NEARAI_MODEL (optional)

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[github-actions]

Hi @think-in-universe! Welcome to the elizaOS community. Thanks for submitting your first pull request; your efforts are helping us accelerate towards AGI. We'll review it shortly. You are now an elizaOS contributor!

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