fix: make transcode leases ownership-checked and cleanup-aware

Cleanup never matched a live session because the controller registered empty
manifest and segment paths, renewal was a read-modify-write that could revert a
takeover, and the takeover script compared an ISO date to a number, so it errored.

- populate the session record's manifest and segment paths from the playlist path
- renew the lease via a Lua compare-and-set on the owning pod
- store the lease expiry as unix milliseconds so the scripts can compare it
- retain the session record past its lease so an orphan can still be taken over
- test the Redis store against a real Redis, including the renew-vs-takeover race
- drop the live stream record nothing ever read back

tests/Jellyfin.Server.Implementations.Tests/SessionManager/SessionManagerTests.cs

@@ -11,7 +11,6 @@ using MediaBrowser.Controller.Drawing;
 using MediaBrowser.Controller.Dto;
 using MediaBrowser.Controller.Events;
 using MediaBrowser.Controller.Library;
-using MediaBrowser.Controller.MediaEncoding;
 using MediaBrowser.Controller.Net;
 using MediaBrowser.Controller.Session;
 using MediaBrowser.Model.Session;
@@ -42,8 +41,7 @@ public class SessionManagerTests
             Mock.Of<IServerApplicationHost>(),
             Mock.Of<IDeviceManager>(),
             Mock.Of<IMediaSourceManager>(),
-            Mock.Of<IHostApplicationLifetime>(),
-            new NullTranscodeSessionStore());
+            Mock.Of<IHostApplicationLifetime>());
 
         await Assert.ThrowsAsync(exceptionType, () => sessionManager.GetAuthorizationToken(
             new User("test", "default", "default"),
@@ -70,8 +68,7 @@ public class SessionManagerTests
             Mock.Of<IServerApplicationHost>(),
             Mock.Of<IDeviceManager>(),
             Mock.Of<IMediaSourceManager>(),
-            Mock.Of<IHostApplicationLifetime>(),
-            new NullTranscodeSessionStore());
+            Mock.Of<IHostApplicationLifetime>());
 
         await Assert.ThrowsAsync(exceptionType, () => sessionManager.AuthenticateNewSessionInternal(authenticationRequest, false));
     }
@@ -241,8 +238,7 @@ public class SessionManagerTests
             Mock.Of<IServerApplicationHost>(),
             Mock.Of<IDeviceManager>(),
             Mock.Of<IMediaSourceManager>(),
-            Mock.Of<IHostApplicationLifetime>(),
-            new NullTranscodeSessionStore());
+            Mock.Of<IHostApplicationLifetime>());
     }
 
     // All sessions are logged with the same client and device id on purpose, those values are taken