Initial project setup: solution + 5 projects

- Domain, Infrastructure, Application (class libraries)
- Web (ASP.NET Core empty)
- Admin (Blazor Server)
- All net8.0 target framework
- Project references configured

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,56 @@
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# Visual Studio
+.vs/
+*.suo
+*.sln.docstates
+*.user
+*.userosscache
+*.sln.iml
+
+# dotnet
+project.lock.json
+project.fragment.lock.json
+artifacts/
+*.nuget.props
+*.nuget.targets
+
+# Test results
+TestResults/
+*.trx
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# NuGet
+packages/
+.nuget/
+
+# Publish
+publish/
+PublishProfiles/
+
+# Local environment
+.env
+.env.local
+appsettings.Development.json