fix temp collection config and migrate it

LightlessSync/LightlessConfiguration/TempCollectionConfigService.cs

@@ -0,0 +1,12 @@
+using LightlessSync.LightlessConfiguration.Configurations;
+
+namespace LightlessSync.LightlessConfiguration;
+
+public sealed class TempCollectionConfigService : ConfigurationServiceBase<TempCollectionConfig>
+{
+    public const string ConfigName = "tempcollections.json";
+
+    public TempCollectionConfigService(string configDir) : base(configDir) { }
+
+    public override string ConfigurationName => ConfigName;
+}