chore(log): downgrade "no backend name" domain-skip from WARNING to INFO

generate_config emits "Skipping domain <host> - no backend name" on every run
for domains registered without a proxy backend — most commonly the panel's own
hostname (whpNN.cloud-hosting.io), which lives in the DB only for certificate
management and intentionally has no backend. Logging it at WARNING tripped the
WHP AI log monitor as a recurring error and prompted a bogus "restart
haproxy-manager" remediation. It's expected, benign, and recurs by design.

Log it at INFO instead (consistent with the sibling per-domain "Added ACL for
domain" INFO lines) with a clearer message ("no proxy backend
(cert/management-only)"). Verified against the WHP monitor's ErrorClassifier:
the old WARNING line classified as non_critical (captured); the new INFO line
classifies as None (skipped) — so it no longer shows up in reports, while
remaining visible in container logs for manual routing debugging.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

VERSION

@@ -1 +1 @@
-2026.07.1
+2026.07.2

haproxy_manager.py

@@ -1855,7 +1855,11 @@ def generate_config():
         # First pass: exact domain ACLs (higher priority - evaluated first)
         for domain in exact_domains:
             if not domain['backend_name']:
-                logger.warning(f"Skipping domain {domain['domain']} - no backend name")
+                # Expected for domains registered without a proxy backend (e.g. the
+                # panel's own hostname, present only for certificate management).
+                # Log at INFO — not WARNING — so it doesn't trip log monitors as an
+                # error; it recurs on every generate_config by design.
+                logger.info(f"Skipping domain {domain['domain']} - no proxy backend (cert/management-only)")
                 continue
 
             try:
@@ -1874,7 +1878,8 @@ def generate_config():
         # Second pass: wildcard domain ACLs (lower priority - evaluated after exact matches)
         for domain in wildcard_domains:
             if not domain['backend_name']:
-                logger.warning(f"Skipping wildcard domain {domain['domain']} - no backend name")
+                # See note above — INFO, not WARNING; expected for cert/management-only domains.
+                logger.info(f"Skipping wildcard domain {domain['domain']} - no proxy backend (cert/management-only)")
                 continue
 
             try: