Initial commit: RR3 Community Server with web admin panel

- ASP.NET Core 8 REST API server
- 12 API endpoints matching EA Synergy protocol
- SQLite database with Entity Framework Core
- Web admin panel with Bootstrap 5
- User, Catalog, Session, Purchase management
- Comprehensive documentation

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

RR3CommunityServer/obj/Debug/net8.0/RR3CommunityServer.RazorAssemblyInfo.cs

@@ -0,0 +1,17 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: Microsoft.AspNetCore.Mvc.ApplicationParts.ProvideApplicationPartFactoryAttribute(("Microsoft.AspNetCore.Mvc.ApplicationParts.ConsolidatedAssemblyApplicationPartFact" +
+    "ory, Microsoft.AspNetCore.Mvc.Razor"))]
+
+// Generated by the MSBuild WriteCodeFragment class.
+