The web no longer reads GET /api/feature-flags: useFeatureFlags and its
query key are gone, and use-ai-capability gains the two readers the Coach
pages and the operator notice need. A structural guard fails when web code
reads the retired projection, and when a module requests an AI route
without being registered with the capability that gates it.
Adds the copy for every new state in all seven locales and drops the
per-card no-provider strings.