feat: add authenticated live podcasts and simplify native video playback

Include podcast capture, ingestion and replay, dependency and installer updates, and native video positioning after navigation.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/Yavsc.Abstract/Streaming/Podcast.cs

@@ -0,0 +1,28 @@
+using System.ComponentModel.DataAnnotations;
+using System.Text.Json.Serialization;
+
+namespace Yavsc.Abstract.Streaming;
+
+/// <summary>The lifecycle of a retained live broadcast.</summary>
+[JsonConverter(typeof(JsonStringEnumConverter<PodcastState>))]
+public enum PodcastState { Live, Completed, Interrupted }
+
+/// <summary>Creates an authenticated live broadcast with a retained replay.</summary>
+public sealed record CreatePodcastRequest
+{
+    [Required, StringLength(160, MinimumLength = 1)]
+    public required string Title { get; init; }
+}
+
+/// <summary>A broadcast available to authenticated listeners.</summary>
+public sealed record PodcastResponse(
+    Guid Id, string Title, string OwnerId, string OwnerName,
+    DateTimeOffset CreatedAt, DateTimeOffset UpdatedAt, PodcastState State,
+    int SegmentCount, long Bytes, double DurationSeconds);
+
+/// <summary>An independently decodable MPEG-TS HLS segment.</summary>
+public sealed record PodcastSegmentResponse(int Sequence, double DurationSeconds, int Bytes);
+
+/// <summary>The ordered, committed segments of a live broadcast or replay.</summary>
+public sealed record PodcastManifestResponse(
+    PodcastResponse Podcast, IReadOnlyList<PodcastSegmentResponse> Segments);