config: switch LLM provider to aliyun and remove unused code

[iohub]

Changes:

• Switch default LLM provider from xiaomi to aliyun in config
• Remove user_response.go which contained unused user response handling logic
• Clean up commented provider options in configuration

Summary by Sourcery

Switch the default LLM provider configuration and remove unused assistant response code.

Enhancements:

• Change the default LLM provider from Xiaomi to Aliyun in the configuration and clean up obsolete provider options.

Chores:

• Delete the unused user_response assistant handling module.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Switches the configured default LLM provider to Aliyun and removes unused assistant user response handling code, along with minor cleanup of commented-out provider options in the config.

File-Level Changes

Change	Details	Files
Update default LLM provider configuration to use Aliyun instead of Xiaomi.	Change the active use_provider value in the [llm] section from xiaomi to aliyun Refresh commented example provider option to reference openrouter instead of streamlake/siliconflow	config/config.toml
Remove dead code related to assistant user response handling.	Delete the unused user_response.go implementation from the assistant package	internal/assistant/user_response.go

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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