Feature/replace cc switch

[deitxfge]

No description provided.

[gemini-code-assist]

Code Review

This pull request transitions the default LLM provider from CC Switch to DeepSeek, updating configuration files, documentation, and tests, and introducing a new LLMProviderError for robust error handling. The review feedback points out that the model name 'deepseek-v4-flash' is invalid and should be updated to 'deepseek-chat' across configurations and tests. Additionally, the reviewer advises against committing the local configuration file 'config/local.yaml' and recommends catching potential JSON decoding errors when parsing the LLM response to prevent unhandled exceptions.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.

[skyloevil]

LGTM