Initial commit: nightly iOS app + Supabase backend

iOS SwiftUI app with Supabase auth/realtime, Node.js backend,
Docker/Supabase self-hosted infrastructure, and APNs scheduler.

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

ios/NightThoughts/Services/NotificationService.swift

@@ -0,0 +1,16 @@
+import UserNotifications
+import UIKit
+
+final class NotificationService {
+    static let shared = NotificationService()
+
+    func requestPermission() async -> Bool {
+        (try? await UNUserNotificationCenter.current()
+            .requestAuthorization(options: [.alert, .sound, .badge])) ?? false
+    }
+
+    @MainActor
+    func registerForRemoteNotifications() {
+        UIApplication.shared.registerForRemoteNotifications()
+    }
+}