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/Properties/serviceDependencies.json

@@ -0,0 +1,8 @@
+{
+  "dependencies": {
+    "mssql1": {
+      "type": "mssql",
+      "connectionId": "ConnectionStrings:DefaultConnection"
+    }
+  }
+}