Cleanup extracted files (#13760)

* Cleanup extracted files

* Pagination and fixes

* Add migration for attachments to MigrateLibraryDb

* Unify attachment handling

* Don't extract again if files were already extracted

* Fix MKS attachment extraction

* Always run full extraction on mks

* Don't try to extract mjpeg streams as attachments

* Fallback to check if attachments were extracted to cache folder

* Fixup

src/Jellyfin.Database/Jellyfin.Database.Implementations/Entities/AttachmentStreamInfo.cs

@@ -25,7 +25,7 @@ public class AttachmentStreamInfo
     /// <summary>
     /// Gets or Sets the codec of the attachment.
     /// </summary>
-    public required string Codec { get; set; }
+    public string? Codec { get; set; }
 
     /// <summary>
     /// Gets or Sets the codec tag of the attachment.

src/Jellyfin.Database/Jellyfin.Database.Providers.Sqlite/Migrations/20250331182844_FixAttachmentMigration.cs

@@ -0,0 +1,36 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Jellyfin.Server.Implementations.Migrations
+{
+    /// <inheritdoc />
+    public partial class FixAttachmentMigration : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<string>(
+                name: "Codec",
+                table: "AttachmentStreamInfos",
+                type: "TEXT",
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "TEXT");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<string>(
+                name: "Codec",
+                table: "AttachmentStreamInfos",
+                type: "TEXT",
+                nullable: false,
+                defaultValue: string.Empty,
+                oldClrType: typeof(string),
+                oldType: "TEXT",
+                oldNullable: true);
+        }
+    }
+}

src/Jellyfin.Database/Jellyfin.Database.Providers.Sqlite/Migrations/JellyfinDbModelSnapshot.cs

@@ -120,7 +120,6 @@ namespace Jellyfin.Server.Implementations.Migrations
                         .HasColumnType("INTEGER");
 
                     b.Property<string>("Codec")
-                        .IsRequired()
                         .HasColumnType("TEXT");
 
                     b.Property<string>("CodecTag")