[Bugfix] Gate Kimi-K3 KDA warmup on sys.modules to skip Kimi import for non-Kimi models (#59257)

Signed-off-by: YueshenZ <YueshenZ@users.noreply.github.com>
Signed-off-by: zjy0516 <riverclouds.zhu@qq.com>
Co-authored-by: YueshenZ <YueshenZ@users.noreply.github.com>
Co-authored-by: Claude Code <noreply@anthropic.com>
Co-authored-by: Codex <noreply@openai.com>
Co-authored-by: zjy0516 <riverclouds.zhu@qq.com>