docs: restructure v1.1 milestone for multi-library support
- Rename milestone from 'Features & Extensibility' to 'Multi-Library Support' - Replace old phases 10-14 (TAG/SMRT/GAP/MB/LAYOUT/PLUG) with 20 multi-library requirements (LIB/LSCAN/VIEW/PLAY/DATA) - Move deferred features to Future Requirements - Update research files with multi-library research (Stack, Features, Architecture, Pitfalls) - Architecture: hybrid model (library_id on audio_files only), libraries in DB, sequential scanning, phantom tracks
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