feat: Initialize Strata KitchenSink application boilerplate

This sets up the foundational structure for a .NET Core 6 / React project,
demonstrating common architectural patterns, Docker integration, and key
Strata libraries for API, data access (EF Core), background jobs (Hangfire),
real-time communication (SignalR), and various frontend UI components.

.dockerignore

@@ -0,0 +1,10 @@
+.dockerignore
+Dockerfile
+Dockerfile.local
+.env
+.gitignore
+.vs
+.vscode
+**/bin
+**/obj
+**/.toolstarget