Trust the RFC 1918 ranges as proxies when TRUSTED_PROXIES is unset (closes #333) #336

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@@ -2722,9 +2722,10 @@ re-fills both verification slots on its first two requests. The
remedies are to block the source at the reverse proxy, or to
rate-limit `POST /pages/login` there — the one place a limit can be
applied without reintroducing the lockout, because the proxy sees the
real client address. `TRUSTED_PROXIES` does not stop the saturation,
but when it covers the proxy the source is visible in the failure logs,
and the default covers a proxy on a private network.
real client address. `TRUSTED_PROXIES` does not stop the saturation.
The flood's source is in the proxy's access log: webhooker's own logs
record the proxy's address, not the client's (see
[Deployment behind a reverse proxy](#deployment-behind-a-reverse-proxy)).
Finer-grained per-webhook rate limits (configured in the web UI and
enforced in the webhook handler) can layer on top of this env-level