feat: add deepseek provider

[tangbiubiu]

The deepseek provider has been added.
And the corresponding modifications have been made to the .env.example and README.

[gemini-code-assist]

Summary of Changes

Hello @tangbiubiu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces support for DeepSeek models by integrating a new DeepSeekProvider. This enhancement allows users to leverage DeepSeek's capabilities for both orchestrator and cypher model roles within the application. The changes also include necessary updates to the configuration examples and documentation to guide users on how to set up and utilize the new provider.

Highlights

• DeepSeek Provider Integration: A new DeepSeekProvider class has been implemented, allowing the system to utilize DeepSeek models for both orchestration and cypher tasks.
• Configuration Updates: The .env.example file now includes commented-out examples for configuring DeepSeek as both an orchestrator and cypher provider, complete with API key and model suggestions.
• Documentation Enhancement: The README.md has been updated to reflect the new DeepSeek provider, including a dedicated section for 'All Deepseek Models' configuration and extending the list of supported providers for both ORCHESTRATOR_PROVIDER and CYPHER_PROVIDER variables.

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[gemini-code-assist]

Code Review

This pull request introduces support for the DeepSeek provider, including configuration examples in .env.example and README.md, and the necessary provider implementation in codebase_rag/providers/base.py. The changes are well-structured. My feedback focuses on improving documentation consistency, ensuring type consistency in the new provider implementation, and encouraging the addition of unit tests for the new functionality to maintain code quality.

[gemini-code-assist]

The example numbering here is inconsistent with the README.md file. This section is labeled "Example 6", but in the README.md it is introduced as "Option 4". To avoid user confusion, it would be best to align the numbering and naming convention across both files.

# Example 4: All DeepSeek

[vitali87]

Thanks for this!

PR #161 adds LiteLLM support (coming soon), which handles DeepSeek along with 100+ other providers - see https://docs.litellm.ai/docs/providers/deepseek

We'd suggest closing this PR to avoid maintaining separate provider classes for each cloud service.

If you think there's value in having a dedicated DeepSeek provider that LiteLLM doesn't cover, let us know - happy to hear your thoughts.