feat: Add number key selection to CLI permissions

[chriswingler]

What feature would you like to see?

CLI selection options like:

1. Approve
2. Approve for session
3. Decline

The WebUI has this now and KimiCLI should maintain feature parity.

Additional information

No response

[Br1an67]

Number key selection for CLI approval prompts has been implemented in the current codebase. The approval UI now shows [1], [2], [3], [4] labels next to each option, and pressing the corresponding number key directly selects and submits that choice — no need for arrow keys + Enter.

This was part of a broader approval UX improvement including a new "Skip" option (see #1506).