Complete Visual Studio 2022 server project setup

- Created organized .NET 8 solution with server-focused project structure
- Added server projects: API, Core, Data, Shared, SignalR, and Admin projects in src/server/
- Added comprehensive server test project structure in tests/server/
- Configured project dependencies and references for server architecture
- Installed required NuGet packages for Entity Framework, PostgreSQL, Redis, JWT, SignalR
- Created server-focused solution filters for different development contexts
- Organized projects into logical solution folders (src/server, tests/server)
- Set up proper build dependencies and startup configuration for server components
- Created initial folder structure within each server project
- Prepared client directory structure for future Unity integration
- Verified successful compilation of entire server solution

ShadowedRealmsMobile/src/server/ShadowedRealms.Admin/appsettings.json

@@ -0,0 +1,12 @@
+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=aspnet-ShadowedRealms.Admin-6edaa4c8-3d68-44fa-8032-b753cd9ade75;Trusted_Connection=True;MultipleActiveResultSets=true"
+  },
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}