init backend

.gitignore

@@ -0,0 +1,32 @@
+# .NET
+dotnet/**/bin/
+dotnet/**/obj/
+dotnet/**/*.user
+dotnet/**/*.vs/
+dotnet/**/.vs/
+
+# React/Node
+react/node_modules/
+react/dist/
+react/.env
+react/.env.local
+react/.env.*.local
+
+# IDE
+.idea/
+.vscode/
+*.suo
+*.ntvs*
+*.njsproj
+*.sln.docstates
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+npm-debug.log*
+
+# Claude Code plans
+.claude/