Split AuthService/Server

some refactoring
fix some stuff
add http context accessor
configure metrics as well
commit 713d054ccb965f7adb8eafa6e3fb52853a1e6dd2 (partial, Docker only)

MareSynchronosServer/MareSynchronosStaticFilesServer/Services/CachedFileProvider.cs

@@ -5,6 +5,7 @@ using System.Collections.Concurrent;
 using System.Net.Http.Headers;
 using MareSynchronosShared.Utils;
 using MareSynchronos.API.Routes;
+using MareSynchronosShared.Utils.Configuration;
 
 namespace MareSynchronosStaticFilesServer.Services;