PRICE-01 review 3: tests for the round 3 note and dismiss; doc wording

- test_price_secret.py: the fixed-tariff note on the real /config/validate
  route, EN and NL, and none for a spaces-only profile (web.py lang wiring).
- test_price_service.py: the start line is INFO, not WARNING; a dismiss that
  raises does not stop the cycle.
- test_maint13/test_setup_only/test_watchdog: ignore only the dismiss of the
  old card, so a create with that id is still counted.
- DECISIONS rule 7 quotes the settings note as it is; messages.py comment.

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

goodwe_controller/app/messages.py

@@ -369,7 +369,7 @@ def prices_back() -> Dismiss:
 
 
 # PRICE-01: a fixed tariff beside the price service. One true sentence, for the
-# start-up log and the settings page (neither has a Dutch layer).
+# start-up log (English only, as every log line) and the settings page (EN, NL).
 FIXED_TARIFF_LOG = "Fixed tariff is only used if no prices are available."
 FIXED_TARIFF_NOTE = ("With the price service, the fixed tariff is only used if "
                      "no prices are available.")