xkeen -ux installs Xray 26.3.27 on Keenetic mipselsf, but this build crashes; please add warning or blocklist

Environment: - Router: Keenetic Ultra - OS: KeeneticOS / Linux 4.9-ndm-5 - Entware feed: `mipselsf-k3.4` - Date observed: June 5, 2026 What happened: - `xkeen -ux` successfully offered Xray 26.3.27 - after update, the router-side `xray` binary crashed immediately - it failed on `xray version`, `xray -test`, and normal startup - router had to be rolled back manually to 26.2.6 Confirmed behavior on the same device: - Xray 26.2.6 works - Xray 26.3.27 crashes Crash type: - Go runtime `SIGSEGV` - observed on official `mips32le` release for Xray 26.3.27 Request: Please consider one of the following for `mipselsf` / Keenetic MIPS routers: - version blacklist for Xray 26.3.27 - warning before installing this version - optional platform-specific safe version recommendation This would prevent breaking live routers through `xkeen -ux`. Note: The problem appears to be in the upstream Xray binary for this platform, not in XKeen config generation itself. But `xkeen -ux` currently allows installing a known-bad version on this hardware class.