Add asset management migration

- UpdateGameAssetFields migration for new columns
- Added Description, IsRequired, UploadedAt to GameAssets
- Fixed nullable LocalPath and FileSha256

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

RR3CommunityServer/obj/Debug/net8.0/RR3CommunityServer.GeneratedMSBuildEditorConfig.editorconfig

@@ -26,14 +26,30 @@ build_property.EnableCodeStyleSeverity =
 build_metadata.AdditionalFiles.TargetPath = UGFnZXNcQWRtaW4uY3NodG1s
 build_metadata.AdditionalFiles.CssScope = 
 
+[E:/rr3/RR3CommunityServer/RR3CommunityServer/Pages/Assets.cshtml]
+build_metadata.AdditionalFiles.TargetPath = UGFnZXNcQXNzZXRzLmNzaHRtbA==
+build_metadata.AdditionalFiles.CssScope = 
+
 [E:/rr3/RR3CommunityServer/RR3CommunityServer/Pages/Catalog.cshtml]
 build_metadata.AdditionalFiles.TargetPath = UGFnZXNcQ2F0YWxvZy5jc2h0bWw=
 build_metadata.AdditionalFiles.CssScope = 
 
+[E:/rr3/RR3CommunityServer/RR3CommunityServer/Pages/DeviceSettings.cshtml]
+build_metadata.AdditionalFiles.TargetPath = UGFnZXNcRGV2aWNlU2V0dGluZ3MuY3NodG1s
+build_metadata.AdditionalFiles.CssScope = 
+
+[E:/rr3/RR3CommunityServer/RR3CommunityServer/Pages/Login.cshtml]
+build_metadata.AdditionalFiles.TargetPath = UGFnZXNcTG9naW4uY3NodG1s
+build_metadata.AdditionalFiles.CssScope = 
+
 [E:/rr3/RR3CommunityServer/RR3CommunityServer/Pages/Purchases.cshtml]
 build_metadata.AdditionalFiles.TargetPath = UGFnZXNcUHVyY2hhc2VzLmNzaHRtbA==
 build_metadata.AdditionalFiles.CssScope = 
 
+[E:/rr3/RR3CommunityServer/RR3CommunityServer/Pages/Register.cshtml]
+build_metadata.AdditionalFiles.TargetPath = UGFnZXNcUmVnaXN0ZXIuY3NodG1s
+build_metadata.AdditionalFiles.CssScope = 
+
 [E:/rr3/RR3CommunityServer/RR3CommunityServer/Pages/Rewards.cshtml]
 build_metadata.AdditionalFiles.TargetPath = UGFnZXNcUmV3YXJkcy5jc2h0bWw=
 build_metadata.AdditionalFiles.CssScope =