setup.sh and deploy/hetzner.sh emitted WEBCLAW_AUTH_KEY into the server's
.env, but webclaw-server reads WEBCLAW_API_KEY (env = "WEBCLAW_API_KEY").
The generated key was silently ignored — and since hetzner.sh binds
0.0.0.0, the server refused to start at all (it rejects a public bind
without WEBCLAW_API_KEY). Fix both .env writers, plus the hetzner help
line that told users to grep the wrong name and the env.example sample.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>