Add version 1.0.5 and /api/version endpoint

- Added Version, AssemblyVersion, and FileVersion to project file
- Added /api/version endpoint returning version info
- Follows SilverPay versioning pattern

🤖 Generated with [Claude Code](https://claude.ai/code)

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

LittleShop/Program.cs

@@ -280,6 +280,19 @@ app.MapHub<LittleShop.Hubs.ActivityHub>("/activityHub");
 // Health check endpoint
 app.MapHealthChecks("/health");
 
+// Version endpoint
+app.MapGet("/api/version", () =>
+{
+    var version = typeof(Program).Assembly.GetName().Version?.ToString() ?? "1.0.0";
+    var assemblyVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "1.0.0";
+    return Results.Ok(new
+    {
+        version = assemblyVersion,
+        environment = builder.Environment.EnvironmentName,
+        application = "LittleShop"
+    });
+});
+
 // Apply database migrations and seed data
 using (var scope = app.Services.CreateScope())
 {