ConnectionBootstrap kept a private cache read/fetch/write path for Plex
Home users beside PlexHomeService, which already owns refresh
coalescing, generation checks, durable writes, and publication. The
bootstrap now keeps only the one-time legacy cache migration, then
reloads the service from storage or asks it to refresh, and reads the
hydrated users from the service snapshot. A failed hydration clears the
service's empty cache slot before the migrated account is removed.
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