v1.4.5 — fix kimi installer target to Kimi Code (~/.kimi-code/skills)

Fixes the kimi installer target: it pointed at the legacy kimi-cli tree (~/.kimi/skills), which Kimi Code (moonshotai/kimi-code) does not read at runtime. It now installs to the canonical ~/.kimi-code/skills (or $KIMI_CODE_HOME/skills), with auto/all detection keyed on real Kimi Code evidence rather than the ambiguous kimi command shared with the older kimi-cli.

Portable Windows executables are attached by CI.