NEO-29: align hotbar persistence test to AAA style

Refactor the Postgres hotbar persistence integration test to explicit Arrange/Act/Assert structure so it matches the team testing style guide.

server/NeonSprawl.Server.Tests/Game/AbilityInput/HotbarLoadoutPersistenceIntegrationTests.cs

@@ -15,36 +15,43 @@ public sealed class HotbarLoadoutPersistenceIntegrationTests(PostgresIntegration
     [RequirePostgresFact]
     public async Task PostThenGetAcrossNewFactory_ShouldPersistHotbarBindings()
     {
+        // Arrange
         await ResetHotbarTableAsync();
+        var update = new HotbarLoadoutUpdateRequest
+        {
+            SchemaVersion = HotbarLoadoutUpdateRequest.CurrentSchemaVersion,
+            Slots =
+            [
+                new HotbarSlotBindingJson
+                {
+                    SlotIndex = 1,
+                    AbilityId = PrototypeAbilityRegistry.PrototypePulse,
+                },
+                new HotbarSlotBindingJson
+                {
+                    SlotIndex = 4,
+                    AbilityId = PrototypeAbilityRegistry.PrototypeGuard,
+                },
+            ],
+        };
+        HttpStatusCode postStatus;
 
+        // Act
         using (var firstClient = Factory.CreateClient())
         {
             var post = await firstClient.PostAsJsonAsync(
                 "/game/players/dev-local-1/hotbar-loadout",
-                new HotbarLoadoutUpdateRequest
+                update);
-                {
+            postStatus = post.StatusCode;
-                    SchemaVersion = HotbarLoadoutUpdateRequest.CurrentSchemaVersion,
-                    Slots =
-                    [
-                        new HotbarSlotBindingJson
-                        {
-                            SlotIndex = 1,
-                            AbilityId = PrototypeAbilityRegistry.PrototypePulse,
-                        },
-                        new HotbarSlotBindingJson
-                        {
-                            SlotIndex = 4,
-                            AbilityId = PrototypeAbilityRegistry.PrototypeGuard,
-                        },
-                    ],
-                });
-            Assert.Equal(HttpStatusCode.OK, post.StatusCode);
         }
 
         await using var secondFactory = new PostgresWebApplicationFactory();
         using var secondClient = secondFactory.CreateClient();
         var loadout = await secondClient.GetFromJsonAsync<HotbarLoadoutResponse>(
             "/game/players/dev-local-1/hotbar-loadout");
+
+        // Assert
+        Assert.Equal(HttpStatusCode.OK, postStatus);
         Assert.NotNull(loadout);
         Assert.Equal(PrototypeAbilityRegistry.PrototypePulse, loadout!.Slots[1].AbilityId);
         Assert.Equal(PrototypeAbilityRegistry.PrototypeGuard, loadout.Slots[4].AbilityId);