Refactor SQLite Database Provider

- Removed unused classes and files related to SQLite database provider, including SqliteDesignTimeJellyfinDbFactory, ModelBuilderExtensions, PragmaConnectionInterceptor, AssemblyInfo, SqliteDatabaseProvider, DateTimeKindValueConverter.
- Updated tests to remove dependencies on removed classes and adjusted mocking for configuration sections.
- Added Microsoft.EntityFrameworkCore.Sqlite package reference to test project.
- Improved string handling in tests for better consistency and clarity.
- Refactored logging methods in JellyfinApplicationFactory for better readability and maintainability.

Jellyfin.Server/Migrations/Routines/MigrateKeyframeData.cs

@@ -64,30 +64,36 @@ public class MigrateKeyframeData : IDatabaseMigrationRoutine
         _logger.LogInformation("Checking {Count} items for importable keyframe data.", records);
 
         context.KeyframeData.ExecuteDelete();
-        using var transaction = context.Database.BeginTransaction();
-        do
+
+        // NpgsqlRetryingExecutionStrategy requires all operations inside a user-initiated
+        // transaction to be wrapped with CreateExecutionStrategy().Execute(...).
+        context.Database.CreateExecutionStrategy().Execute(() =>
         {
-            var results = baseQuery.Skip(offset).Take(Limit).Select(b => new Tuple<Guid, string?>(b.Id, b.Path)).ToList();
-            foreach (var result in results)
+            using var transaction = context.Database.BeginTransaction();
+            do
             {
-                if (TryGetKeyframeData(result.Item1, result.Item2, out var data))
+                var results = baseQuery.Skip(offset).Take(Limit).Select(b => new Tuple<Guid, string?>(b.Id, b.Path)).ToList();
+                foreach (var result in results)
                 {
-                    itemCount++;
-                    context.KeyframeData.Add(data);
+                    if (TryGetKeyframeData(result.Item1, result.Item2, out var data))
+                    {
+                        itemCount++;
+                        context.KeyframeData.Add(data);
+                    }
                 }
-            }
 
-            offset += Limit;
-            if (offset > records)
-            {
-                offset = records;
-            }
+                offset += Limit;
+                if (offset > records)
+                {
+                    offset = records;
+                }
 
-            _logger.LogInformation("Checked: {Count} - Imported: {Items} - Time: {Time}", offset, itemCount, sw.Elapsed);
-        } while (offset < records);
+                _logger.LogInformation("Checked: {Count} - Imported: {Items} - Time: {Time}", offset, itemCount, sw.Elapsed);
+            } while (offset < records);
 
-        context.SaveChanges();
-        transaction.Commit();
+            context.SaveChanges();
+            transaction.Commit();
+        });
 
         _logger.LogInformation("Imported keyframes for {Count} items in {Time}", itemCount, sw.Elapsed);