App Store v1: local file import, no YouTube ingest

[sanylax0]

App Store v1 on current main (crash/OOM fixes included). Everything App Review would reject is gone; playback, analysis, and on-device stems stay.

What changed

• YouTubeKit and remote ingest removed (stream/search/playlist resolvers, Spotify, Apple Music → YouTube, catalog search, ranged downloader, share extension, continuity:// URL scheme, clipboard import).
• "+" imports local audio via .fileImporter (files or folders) into Local Files. BPM/key/loudness/stems still run on those files.
• Privacy manifest (PrivacyInfo.xcprivacy: UserDefaults CA92.1, file timestamps C617.1, system boot time 35F9.1 for mach_absolute_time).
• Privacy policy in PRIVACY.md. Version 1.0.0. VoiceOver labels on transport / mini player / scrubber. DEVELOPMENT_TEAM left to the TestFlight workflow instead of project.yml.

Merging this replaces the YouTube TestFlight product with the store cut. That is required for a reviewable binary. Run TestFlight from this branch (Actions → TestFlight → Run workflow → this branch) if you want the store IPA before merging.

What I cannot do from Linux

App Store Connect still needs you:

1. Create version 1.0.0 in App Store Connect (app id 6792130853).
2. Privacy policy URL (after merge): https://github.com/ContinuityInc/Continuity/blob/main/PRIVACY.md
3. Support URL: https://github.com/ContinuityInc/Continuity/issues
4. Screenshots for the required iPhone sizes (6.9" / 6.5"). Device photos of Now Playing + Library.
5. Age rating / encryption (already ITSAppUsesNonExemptEncryption = false).
6. Pick the TestFlight build and Submit for Review.

Suggested listing copy:

• Name: Continuity
• Subtitle: Beatmatched DJ blends
• Description: Continuity is a music player whose song changes are DJ blends: beatmatched, loudness-leveled, and (when stems are ready) vocal-aware. Import your own files from the Files app. Analysis and stem separation run on the device. No accounts, no tracking.
• Category: Music

Linux ContinuityCore tests run in CI. iOS archive has to come from the TestFlight workflow.

Slack Thread