Initialize Blazor SSR project structure

.gitignore

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+## .NET
+bin/
+obj/
+*.user
+*.suo
+*.userosscache
+*.sln.docstates
+.vs/
+.vscode/
+
+## Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+## Visual Studio cache/options directory
+.vs/
+.vscode/
+
+## JetBrains Rider
+.idea/
+*.sln.iml
+
+## User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+## ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
+## Publish profiles
+*.pubxml
+*.azurePubxml
+
+## NuGet Packages
+*.nupkg
+*.snupkg
+**/packages/*
+
+## Node.js (keeping for now, will remove after React cleanup)
+node_modules/
+package-lock.json
+
+## OS files
+.DS_Store
+Thumbs.db