Connection tracker overwrite v1.11.0-alpha.19

[alireza0]

Hello dear developers,

First, thank you for your excellent work on this project!

I have encountered a potential issue in version v1.11.0-alpha.19. The configuration does not support enabling both clash_api and v2ray_api simultaneously. When these two APIs are enabled together, the connection tracker appears to be overwritten, leading to a potential conflict.

This issue seems to stem from the following lines in the configuration:
https://github.com/SagerNet/sing-box/blob/v1.11.0-alpha.19/box.go#L242
and
https://github.com/SagerNet/sing-box/blob/v1.11.0-alpha.19/box.go#L252

Could you please investigate this further? Let me know if additional information or testing is needed from my side.

Thank you again for your dedication and hard work!