PRICE-01 round 3: replace the fixed-tariff notification with a log line and a settings note

G1: remove the false 'Fixed tariff not used' notification. One INFO line at
start and an info note beside the setting (EN/NL) when price_service has a
non-blank static_profile; the old notification id is dismissed at start.
DOCS, migration step 5 and DECISIONS rule 7 now say what the code does.
S05: whitespace-only static_profile counts as not set.
G2: maintenance_enabled read through MaintConfig.from_options().

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bdqr7PiaHcBnzPituu2yTC

goodwe_controller/test_setup_only.py

@@ -454,7 +454,9 @@ check("the saved blob passes the normal gate: no refusal, not setup-only",
 
 print("\n    after the restart, on the saved settings:")
 rc, ev, err, files = run_child("after", SAVED or {}, SAVED_STATE)
-services = [e for e in ev if e[0] == "SERVICE"]
+# Not the dismiss of PRICE-01's old fixed-tariff card, sent at every start.
+services = [e for e in ev if e[0] == "SERVICE"
+            and e[3].get("notification_id") != "goodwe_fixed_tariff_unused"]
 writes = [e[3].get("value") for e in services
           if e[1:3] == ["number", "set_value"]]
 print(f"    after: exit {rc}, {len(services)} service calls, set_value "