Rename UI controllers

BTCPayServer/Controllers/UIStorageController.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+using BTCPayServer.Storage.Services;
+using Microsoft.AspNetCore.Mvc;
+
+namespace BTCPayServer.Storage
+{
+    [Route("Storage")]
+    public class UIStorageController : Controller
+    {
+        private readonly FileService _FileService;
+
+        public UIStorageController(FileService fileService)
+        {
+            _FileService = fileService;
+        }
+
+        [HttpGet("{fileId}")]
+        public async Task<IActionResult> GetFile(string fileId)
+        {
+            var url = await _FileService.GetFileUrl(Request.GetAbsoluteRootUri(), fileId);
+            return new RedirectResult(url);
+        }
+    }
+}