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.

src/Strata.KitchenSink.Api/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Warning"
+    }
+  },
+  "AllowedHosts": "*",
+  "Version": "0.0.0"
+}