Add NAS Cache Proxy PRD v3

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Complete product requirements document covering:
- Transparent SMB/NFS/WebDAV cache proxy with rclone VFS
- SD card ingest + auto archive pipeline for photographers
- Three-timestamp consistency model with write-back controller
- Time Machine backup target with independent sparsebundle sync
- Layered SFTP polling for remote change detection
- Cache space protection and import state machine
- Paid services: Headscale + DERP relay, cloud disaster backup
- Hardware appliance roadmap (v1.0 MVP → v3.0 hardware product)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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grabbit 2026-02-16 18:00:44 +08:00

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