fix: correct legal language for ATProto accuracy (#761)
- remove 'transcode' claim (not implemented)
- clarify: audio files on our servers, track metadata on user's PDS
- 'written to the network' → 'stored on your PDS, public and accessible via ATProto'
- clarify plyr.fm does not operate a PDS—writes to user's existing PDS
- update last updated dates
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