ApiKey 长度限制导致Minimax 模型不能正常添加

[virtheart]

Pre-checks

• I have searched existing issues and this is not a duplicate.

Deployment Method

Docker

Steps to Reproduce

由于Minimax的APIKey很长，api_key_encrypted限制了500长度，无法正常保存

Expected vs Actual Behavior

Minimax 模型正常添加保存

Logs / Screenshots

No response