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.

Notes/Views/Settings/SettingsView.swift

@@ -1,8 +1,11 @@
+import IndieAbout
+import IndieBackup
 import SwiftUI
 
 struct SettingsView: View {
     @Environment(SyncEngine.self) private var syncEngine
     @Environment(ContextService.self) private var contextService
+    @EnvironmentObject private var backupController: BackupController
 
     var body: some View {
         NavigationStack {
@@ -48,6 +51,17 @@ struct SettingsView: View {
                     }
                     .disabled(contextService.isRefreshing)
                 }
+
+                BackupsSectionView(controller: backupController)
+
+                Section {
+                    IndieAbout(configuration: .init(
+                        documents: [
+                            .license(filename: "LICENSE", extension: "md"),
+                            .custom(title: "Changelog", filename: "CHANGELOG", extension: "md")
+                        ]
+                    ))
+                }
             }
             .formStyle(.grouped)
             .navigationTitle("Settings")