fix(health): suppress 404 when health monitor disabled + fix audit test assertion

- Sidebar.svelte: defer healthStore.refresh() until feature flags confirm
  health_monitor is enabled; skip entirely when disabled
- health.js: remove throw error from catch block — log and return null
  instead, preventing 'Uncaught (in promise)' on expected 404
- test_report_audit_immutability.py: fix mock assertions —
  audit_service uses logger.reason/reflect/explore, not logger.info
- HealthStore and Sidebar now produce zero network noise when
  FEATURES__HEALTH_MONITOR=false

backend/src/plugins/translate/plugin.py

@@ -1,9 +1,9 @@
 # #region TranslatePlugin [C:2] [TYPE Module] [SEMANTICS clickhouse, translate, sql, dashboard, dialect]
 # @BRIEF TranslatePlugin skeleton for cross-dialect SQL and dashboard translation.
-# @LAYER: Domain
+# @LAYER Domain
 # @RELATION INHERITS -> [PluginBase]
-# @RATIONALE: Separate plugin avoids bloating LLMAnalysisPlugin beyond fractal limit (<400 lines).
-# @REJECTED: Extending LLMAnalysisPlugin would conflate two distinct feature domains.
+# @RATIONALE Separate plugin avoids bloating LLMAnalysisPlugin beyond fractal limit (<400 lines).
+# @REJECTED Extending LLMAnalysisPlugin would conflate two distinct feature domains.
 
 from typing import Any