add native debrid stream playback

Dreamio/NativePlaybackBackend.swift

@@ -0,0 +1,22 @@
+import UIKit
+
+protocol NativePlaybackBackend: AnyObject {
+    var view: UIView { get }
+    var onReady: (() -> Void)? { get set }
+    var onFailure: ((Error) -> Void)? { get set }
+
+    func prepare(in viewController: UIViewController)
+    func play(request: NativePlaybackRequest)
+    func stop()
+}
+
+enum NativePlaybackError: LocalizedError {
+    case backendUnavailable
+
+    var errorDescription: String? {
+        switch self {
+        case .backendUnavailable:
+            return "Native playback is not available in this build."
+        }
+    }
+}