hermes - 💡(How to fix) Fix Bug: Config accumulates multiple model entries after running hermes model multiple times

Description

After running hermes setup or hermes model multiple times, the config.yaml file accumulates multiple model configuration entries instead of overwriting the previous ones.

Steps to Reproduce

1. Run hermes model to configure a model (e.g., GLM, with a typo in URL like http://xxx.cm)
2. Run hermes model again to configure another model
3. Check ~/.hermes/config.yaml - you will find multiple model configuration entries

Expected Behavior

• Each run of hermes model should overwrite the previous model configuration, not append
• Or at least clearly inform the user about the current configuration and priority

Actual Behavior

• Multiple model entries accumulate in the yaml file
• It is unclear which configuration is read at startup, priority is not defined
• Because the first URL has a typo, the entire model connection fails

Environment

• OS: Linux
• Hermes version: Latest

Suggestions

1. Show current configuration status after each setup/model command
2. Warn when configuration accumulation is detected
3. Document the configuration priority/load order clearly