chore: add .editorconfig and consistent formatting for backend projects

Adds an `.editorconfig` file with C# and project-specific conventions. Applies consistent indentation and formatting across backend handlers, runtime models, and AI services.

apps/backend/Ships/Api/EnqueueShipOrderHandler.cs

@@ -4,36 +4,36 @@ namespace SpaceGame.Api.Ships.Api;
 
 public sealed class EnqueueShipOrderHandler(WorldService worldService) : Endpoint<ShipOrderCommandRequest, ShipSnapshot>
 {
-  public override void Configure()
-  {
-    Post("/api/ships/{shipId}/orders");
-    AllowAnonymous();
-  }
-
-  public override async Task HandleAsync(ShipOrderCommandRequest request, CancellationToken cancellationToken)
-  {
-    var shipId = Route<string>("shipId");
-    if (string.IsNullOrWhiteSpace(shipId))
+    public override void Configure()
     {
-      await SendNotFoundAsync(cancellationToken);
-      return;
+        Post("/api/ships/{shipId}/orders");
+        AllowAnonymous();
     }
 
-    try
+    public override async Task HandleAsync(ShipOrderCommandRequest request, CancellationToken cancellationToken)
     {
-      var snapshot = worldService.EnqueueShipOrder(shipId, request);
-      if (snapshot is null)
-      {
-        await SendNotFoundAsync(cancellationToken);
-        return;
-      }
+        var shipId = Route<string>("shipId");
+        if (string.IsNullOrWhiteSpace(shipId))
+        {
+            await SendNotFoundAsync(cancellationToken);
+            return;
+        }
 
-      await SendOkAsync(snapshot, cancellationToken);
+        try
+        {
+            var snapshot = worldService.EnqueueShipOrder(shipId, request);
+            if (snapshot is null)
+            {
+                await SendNotFoundAsync(cancellationToken);
+                return;
+            }
+
+            await SendOkAsync(snapshot, cancellationToken);
+        }
+        catch (InvalidOperationException ex)
+        {
+            AddError(ex.Message);
+            await SendErrorsAsync(cancellation: cancellationToken);
+        }
     }
-    catch (InvalidOperationException ex)
-    {
-      AddError(ex.Message);
-      await SendErrorsAsync(cancellation: cancellationToken);
-    }
-  }
 }