JobSubmitRequest gains a FromHost field, populated in BuildJobRequest()
via os.Hostname(). Matches how traditional batch schedulers report the
submitting host, and sidesteps having the server derive it from the
connection (which apiserver was doing via ctx.ClientIP() -- an IP not
a hostname, and spoofable via X-Forwarded-For since this apiserver
never configures gin's TrustedProxies).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AgYRU3zDTqNGV5Jk8aiKLg
Rongsong Shen
4fad788430