Use unfingerprinted LM prefix cache names

Update LM prefix caches for fingerprint ca92f8f2ce578604

Migrate all system voice caches to version 2 flat snapshot format

Remove nested preset LM prefix cache directory

Flatten preset LM prefix caches

Upload preset voice LM prefix KV caches

Add VAE decode context voice caches

Remove legacy VAE voice caches

Migrate voice caches to feature embeddings

Add included voice caches