feat: default new uploads to store audio on user's PDS (#1060)
PDS audio uploads were opt-in; flip the default so new uploads go to
the user's PDS automatically. Users who have never toggled the setting
get PDS uploads; users who explicitly disabled it stay opted out.
Falls back to R2-only if the PDS rejects the blob (too large).
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
authored by
zzstoatzz.io