feat: add bootstrap architecture and common utilities for Unity project

- Add GameLifetimeScope for dependency injection with Zenject
- Implement boot flow service with entry point and interfaces
- Create boot state machine (Splash, Menu, Load states)
- Add UI views for boot screens
- Add common services base class and interface
- Implement generic state machine controller
- Add base UI view components and ViewModel interface
- Update SampleScene.unity
- Add BootSettings asset

Добавлена архитектура bootstrap и общие утилиты для Unity проекта:
- Добавлен GameLifetimeScope для внедрения зависимостей (Zenject)
- Реализован сервис потока загрузки с точкой входа и интерфейсами
- Создана машина состояний загрузки (Splash, Menu, Load состояния)
- Добавлены UI представления для экранов загрузки
- Добавлены базовые классы сервисов и интерфейс IService
- Реализован контроллер машины состояний
- Добавлены базовые компоненты UI вида и интерфейс ViewModel
- Обновлена сцена SampleScene.unity
- Добавлен ассет BootSettings

Assets/Scripts/Boot/Flow/BootFlowService.cs

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+using System.Threading;
+using Cysharp.Threading.Tasks;
+using QuizPleaseTest.Common.Services;
+
+namespace QuizPleaseTest.Boot.Flow
+{
+    public class BootFlowService : Service, IBootFlowService
+    {
+        public override UniTask InitializeAsync(CancellationToken ct)
+        {
+            return UniTask.CompletedTask;
+        }
+
+        public override UniTask ReleaseAsync(CancellationToken ct)
+        {
+            return UniTask.CompletedTask;
+        }
+    }
+}

Assets/Scripts/Boot/Flow/BootFlowService.cs.meta

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Assets/Scripts/Boot/Flow/BootstrapEntryPoint.cs

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+using System;
+using System.Threading;
+using Cysharp.Threading.Tasks;
+using UnityEngine;
+using VContainer.Unity;
+
+namespace QuizPleaseTest.Boot.Flow
+{
+    public class BootstrapEntryPoint : IStartable, IDisposable
+    {
+        private readonly IBootFlowService _bootFlowService;
+        private CancellationTokenSource _lifetimeCts;
+
+        public BootstrapEntryPoint(IBootFlowService bootFlowService)
+        {
+            _bootFlowService = bootFlowService;
+        }
+
+        public void Start()
+        {
+            _lifetimeCts = new CancellationTokenSource();
+            RunAsync(_lifetimeCts.Token).Forget();
+        }
+
+        public void Dispose()
+        {
+            if (_lifetimeCts == null)
+            {
+                return;
+            }
+
+            _lifetimeCts.Cancel();
+            _bootFlowService.ReleaseAsync(CancellationToken.None).Forget();
+            _lifetimeCts.Dispose();
+            _lifetimeCts = null;
+        }
+
+        private async UniTask RunAsync(CancellationToken ct)
+        {
+            try
+            {
+                await _bootFlowService.InitializeAsync(ct);
+            }
+            catch (OperationCanceledException) when (ct.IsCancellationRequested)
+            {
+            }
+            catch (Exception exception)
+            {
+                Debug.LogException(exception);
+            }
+        }
+    }
+}

Assets/Scripts/Boot/Flow/BootstrapEntryPoint.cs.meta

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Assets/Scripts/Boot/Flow/IBootFlowService.cs

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+using QuizPleaseTest.Common.Services;
+
+namespace QuizPleaseTest.Boot.Flow
+{
+    public interface IBootFlowService : IService
+    {
+    }
+}

Assets/Scripts/Boot/Flow/IBootFlowService.cs.meta

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