fix: add cursor in setup

[xidongc]

when run
./setup --host cursor

the return error is
return: Unknown --host value: cursor (expected claude, codex, kiro, factory, openclaw, or auto)

Add cursor in setup to fix this

[Guria]

This also needs change help text

[xjiaxiang]

and the path of cursor skills should be ~/.cursor/skills-cursor/

[xidongc]

and the path of cursor skills should be ~/.cursor/skills-cursor/

~/.cursor/skills-cursor/ ： Holds Cursor’s built-in skills managed by Cursor itself.
~/.cursor/skills/ ：Holds user third-party skills.

[nehaaprasad]

AI Code Trust — ship readiness

Score: 100 · Verdict: SAFE · Model: deterministic-v1

No blocking issues detected by automated checks.