case 4732 - trusted reverse proxies setting

New config setting AYANOVA_TRUSTED_PROXIES (IP addresses or CIDR networks)
for reverse proxies on another computer: their X-Forwarded-For is used, a
chain of trusted proxies is followed, invalid entries are warned at boot.
X-Forwarded-For from a proxy that is not trusted logs one warning per server
start naming the proxy's address. Without the setting nothing changes (only
a loopback proxy is trusted). Shown in server info; manual page, Linux install
note, changelog. F6 follow-up recorded.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/8.0/ayanova/mkdocs.yml

@@ -200,6 +200,7 @@ nav:
           - "SMTP certificate check": "ops-config-smtp-accept-any-certificate.md"
           - "Security and JWT web tokens": "ops-config-jwt-secret.md"
           - "SuperUser password reset": "ops-config-set-superuser-pw.md"
+          - "Trusted reverse proxies": "ops-config-trusted-proxies.md"
           - "Server error codes": "ops-error-codes.md"
           - "Migrating from AyaNova 7": "ops-import-v7.md"
           - "Metrics": "ops-metrics.md"