Add two entries collected from community support, to both the zh docs and
the en i18n mirror:
- FAQ: installing a skill via CLI reporting `namespace not found` — set the
registry / log in with an API token, and use the correct namespace slug
(`@team/skill` -> `team--skill`); the web UI Install button provides a
ready-made command.
- Troubleshooting: PostgreSQL container failing to start with
`operation not permitted` on bind mounts — fix data volume ownership
(`chown 999:999`), check SELinux, or use the `runtime.sh` script.
Signed-off-by: FenjuFu <92919259+FenjuFu@users.noreply.github.com>
