Feature Request: Support passing System Prompts to Gemini Gems instead of standard chat

[fsankk]

Currently, when sending prompts to Gemini, they are processed through the standard chat interface. However, the standard chat has its own built-in system instructions which may conflict with or dilute user-defined logic.

I would like to request a feature to target Gemini Gems specifically. Since Gems are designed to function as "System Prompts," routing instructions directly to them would provide a more precise and constrained execution environment compared to the current "message-to-chat" approach.

[Nativu5]

Thanks for the suggestion. This is a valid point. We are considering adding support for Gems, but haven't decided how we manage Gems (e.g., should we automatically create/delete Gems for user?).

BTW, I'm kinda busy recently, so PRs are very welcome.

[Vigno04]

added in next commit of #134