Add IndieAbout + IndieBackup, TestFlight release pipeline

IndieAbout: About section in iOS Settings and macOS About window; LICENSE
switched to the portfolio-standard ISC text (reflowed for in-app rendering).

IndieBackup: files-only backup/restore of the iCloud container documents
('.notesbackup' document type on both platforms), SwiftData cache rebuilt
via SyncEngine.rebuildCache() after restore, monitors suspended during the
file swap, onOpenURL import with pre-launch queueing.

Release pipeline: Scripts/release.sh (ios|mac|all) archives and uploads via
xcodebuild + ASC API key; platform-partitioned build numbers (iOS even,
macOS odd) since both targets share one bundle ID and build sequence.

README.md

@@ -16,6 +16,8 @@ the top of the list.
 - **Search** — full-text over note text, tags, and captured place names
 - **iCloud sync** — notes live as JSON files in your iCloud Drive (visible in Files.app) and sync across iPhone and Mac; the local database is just a rebuildable cache
 - **iOS + macOS** — same app, same data, both platforms
+- **Backups** — one-tap local backup and restore of all notes (IndieBackup); backup files can be shared and imported across devices
+- **About screen** — version info, changelog, and license in Settings (iOS) and the About window (macOS) via IndieAbout
 
 Planned: voice notes with transcription, richer context signals, smarter ranking.