refactor(hermes): drop config health check scanner

The Hermes config.yaml schema has stabilized and users have migrated to
the current provider fields, so the value of scanning for model.provider
dangling references, custom_providers shape errors, v12 migration residue
etc. no longer justifies the maintenance surface — and the scan produces
false positives when users keep some providers under Hermes' v12+
providers: dict (Hermes' runtime merges both shapes, but CC Switch's
scanner only looked at the list form).

Removes the whole HermesHealthWarning type, scan_hermes_config_health
command, HermesHealthBanner React component, useHermesHealth hook,
warnings field on HermesWriteOutcome, and the three helper functions
(yaml_as_non_empty_str, collect_mapping_string_keys, hermes_warning)
that only served the scanner. Drops the matching i18n keys in
zh/en/ja and the fixInWebUI button label that only the banner used.

src/hooks/useHermes.ts

@@ -27,7 +27,6 @@ export const hermesKeys = {
   all: ["hermes"] as const,
   liveProviderIds: ["hermes", "liveProviderIds"] as const,
   modelConfig: ["hermes", "modelConfig"] as const,
-  health: ["hermes", "health"] as const,
   memory: (kind: HermesMemoryKind) => ["hermes", "memory", kind] as const,
   memoryLimits: ["hermes", "memoryLimits"] as const,
 };
@@ -41,7 +40,6 @@ export function invalidateHermesProviderCaches(queryClient: QueryClient) {
   return Promise.all([
     queryClient.invalidateQueries({ queryKey: hermesKeys.liveProviderIds }),
     queryClient.invalidateQueries({ queryKey: hermesKeys.modelConfig }),
-    queryClient.invalidateQueries({ queryKey: hermesKeys.health }),
   ]);
 }
 
@@ -65,15 +63,6 @@ export function useHermesModelConfig(enabled: boolean) {
   });
 }
 
-export function useHermesHealth(enabled: boolean) {
-  return useQuery({
-    queryKey: hermesKeys.health,
-    queryFn: () => hermesApi.scanHealth(),
-    staleTime: 30_000,
-    enabled,
-  });
-}
-
 export function useHermesMemory(kind: HermesMemoryKind, enabled: boolean) {
   return useQuery({
     queryKey: hermesKeys.memory(kind),