Add backend projects with core models and tests, setup Godot frontend

backend/MyBiz.slnx

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+<Solution>
+  <Folder Name="/src/">
+    <Project Path="src/MyBiz.Core/MyBiz.Core.csproj" />
+    <Project Path="src/MyBiz.Economy/MyBiz.Economy.csproj" />
+    <Project Path="src/MyBiz.Production/MyBiz.Production.csproj" />
+    <Project Path="src/MyBiz.Trade/MyBiz.Trade.csproj" />
+  </Folder>
+  <Folder Name="/tests/">
+    <Project Path="tests/MyBiz.Tests/MyBiz.Tests.csproj" />
+  </Folder>
+</Solution>

backend/src/MyBiz.Core/Building.cs

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+namespace MyBiz.Core;
+
+/// <summary>
+/// Тип здания
+/// </summary>
+public enum BuildingType
+{
+    // Добыча сырья
+    Farm,               // Ферма
+    CottonField,        // Хлопковое поле
+    Mine,               // Шахта
+    
+    // Производство
+    FoodFactory,        // Пищекомбинат
+    TextileFactory,     // Текстильная фабрика
+    SteelMill,          // Сталелитейный завод
+    PlasticPlant,       // Завод пластика
+    ElectronicsFactory, // Завод электроники
+    AutoFactory,        // Автозавод
+    
+    // Торговля
+    GroceryStore,       // Продуктовый магазин
+    ClothingStore,      // Магазин одежды
+    ElectronicsStore,   // Магазин электроники
+    AutoDealer,         // Автосалон
+    Mall,               // Торговый центр
+    
+    // Исследования
+    Laboratory,         // Лаборатория
+    
+    // Склад
+    Warehouse           // Склад
+}
+
+/// <summary>
+/// Здание
+/// </summary>
+public class Building
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public BuildingType Type { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string CityId { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Уровень здания (влияет на эффективность)
+    /// </summary>
+    public int Level { get; set; } = 1;
+    
+    /// <summary>
+    /// Стоимость постройки
+    /// </summary>
+    public decimal BuildCost { get; set; }
+    
+    /// <summary>
+    /// Стоимость содержания в тик
+    /// </summary>
+    public decimal UpkeepCost { get; set; }
+    
+    /// <summary>
+    /// Вместимость склада
+    /// </summary>
+    public int StorageCapacity { get; set; }
+    
+    /// <summary>
+    /// Количество рабочих мест
+    /// </summary>
+    public int WorkerSlots { get; set; }
+    
+    /// <summary>
+    /// Заполненность рабочими
+    /// </summary>
+    public int Workers { get; set; }
+}

backend/src/MyBiz.Core/City.cs

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+namespace MyBiz.Core;
+
+/// <summary>
+/// Размер города
+/// </summary>
+public enum CitySize
+{
+    Small,      // Малый
+    Medium,     // Средний
+    Large       // Крупный
+}
+
+/// <summary>
+/// Город
+/// </summary>
+public class City
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public string Name { get; set; } = string.Empty;
+    public string Country { get; set; } = string.Empty;
+    public CitySize Size { get; set; }
+    
+    /// <summary>
+    /// Население
+    /// </summary>
+    public int Population { get; set; }
+    
+    /// <summary>
+    /// Доступные здания
+    /// </summary>
+    public List<Building> Buildings { get; set; } = new();
+    
+    /// <summary>
+    /// Рынок города (спрос на продукты)
+    /// </summary>
+    public Dictionary<ProductType, int> MarketDemand { get; set; } = new();
+    
+    /// <summary>
+    /// Предложение на рынке
+    /// </summary>
+    public Dictionary<ProductType, int> MarketSupply { get; set; } = new();
+    
+    /// <summary>
+    /// Текущие цены
+    /// </summary>
+    public Dictionary<ProductType, decimal> Prices { get; set; } = new();
+}

backend/src/MyBiz.Core/Company.cs

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+namespace MyBiz.Core;
+
+/// <summary>
+/// Компания игрока
+/// </summary>
+public class Company
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public string Name { get; set; } = string.Empty;
+    
+    /// <summary>
+    /// Доступные деньги
+    /// </summary>
+    public decimal Cash { get; set; }
+    
+    /// <summary>
+    /// Активы компании
+    /// </summary>
+    public decimal Assets { get; set; }
+    
+    /// <summary>
+    /// Пассивы (долги)
+    /// </summary>
+    public decimal Liabilities { get; set; }
+    
+    /// <summary>
+    /// Прибыль за последний период
+    /// </summary>
+    public decimal LastPeriodProfit { get; set; }
+    
+    /// <summary>
+    /// Список зданий компании
+    /// </summary>
+    public List<Building> Buildings { get; set; } = new();
+    
+    /// <summary>
+    /// Складские запасы
+    /// </summary>
+    public Dictionary<ProductType, int> Inventory { get; set; } = new();
+    
+    /// <summary>
+    /// Открытые технологии
+    /// </summary>
+    public HashSet<string> UnlockedTechnologies { get; set; } = new();
+    
+    /// <summary>
+    /// Рассчитать чистую стоимость
+    /// </summary>
+    public decimal NetWorth => Assets - Liabilities + Cash;
+}

backend/src/MyBiz.Core/Product.cs

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+namespace MyBiz.Core;
+
+/// <summary>
+/// Категория продукта
+/// </summary>
+public enum ProductCategory
+{
+    RawMaterial,    // Сырьё
+    Component,      // Компоненты
+    ConsumerGoods   // Товары народного потребления
+}
+
+/// <summary>
+/// Тип продукта
+/// </summary>
+public enum ProductType
+{
+    // Сырьё
+    Cotton,         // Хлопок
+    Steel,          // Сталь
+    Plastic,        // Пластик
+    FoodRaw,        // Сырьё для еды
+    
+    // Компоненты
+    Fabric,         // Ткань
+    MetalParts,     // Металлические детали
+    PlasticParts,   // Пластиковые детали
+    ElectronicsComponents, // Электронные компоненты
+    
+    // Товары
+    Food,           // Еда
+    Clothing,       // Одежда
+    Electronics,    // Электроника
+    Automobile      // Автомобили
+}
+
+/// <summary>
+/// Продукт
+/// </summary>
+public class Product
+{
+    public ProductType Type { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public ProductCategory Category { get; set; }
+    
+    /// <summary>
+    /// Базовая цена продукта
+    /// </summary>
+    public decimal BasePrice { get; set; }
+    
+    /// <summary>
+    /// Текущая цена (с учётом спроса/предложения)
+    /// </summary>
+    public decimal CurrentPrice { get; set; }
+    
+    /// <summary>
+    /// Доступное количество на рынке
+    /// </summary>
+    public int AvailableQuantity { get; set; }
+    
+    /// <summary>
+    /// Спрос на продукт
+    /// </summary>
+    public int Demand { get; set; }
+}

backend/src/MyBiz.Core/ProductionChain.cs

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+namespace MyBiz.Core;
+
+/// <summary>
+/// Шаг производственной цепочки
+/// </summary>
+public class ProductionStep
+{
+    /// <summary>
+    /// Требуемый продукт
+    /// </summary>
+    public ProductType InputProduct { get; set; }
+    
+    /// <summary>
+    /// Количество требуемого продукта
+    /// </summary>
+    public int InputQuantity { get; set; }
+    
+    /// <summary>
+    /// Время производства (в тиках)
+    /// </summary>
+    public int ProductionTime { get; set; }
+}
+
+/// <summary>
+/// Производственная цепочка
+/// </summary>
+public class ProductionChain
+{
+    public ProductType OutputProduct { get; set; }
+    public BuildingType RequiredBuilding { get; set; }
+    public List<ProductionStep> Steps { get; set; } = new();
+    
+    /// <summary>
+    /// Количество выходного продукта за цикл
+    /// </summary>
+    public int OutputQuantity { get; set; }
+}

backend/tests/MyBiz.Tests/ProductTests.cs

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+using MyBiz.Core;
+
+namespace MyBiz.Tests;
+
+public class ProductTests
+{
+    [Fact]
+    public void Product_Creation_ShouldInitializeProperties()
+    {
+        // Arrange & Act
+        var product = new Product
+        {
+            Type = ProductType.Food,
+            Name = "Bread",
+            Category = ProductCategory.ConsumerGoods,
+            BasePrice = 10m
+        };
+
+        // Assert
+        Assert.Equal(ProductType.Food, product.Type);
+        Assert.Equal("Bread", product.Name);
+        Assert.Equal(ProductCategory.ConsumerGoods, product.Category);
+        Assert.Equal(10m, product.BasePrice);
+    }
+    
+    [Fact]
+    public void Product_CurrentPrice_ShouldDefaultToBasePrice()
+    {
+        // Arrange
+        var product = new Product
+        {
+            BasePrice = 25m
+        };
+
+        // Act
+        product.CurrentPrice = product.BasePrice;
+
+        // Assert
+        Assert.Equal(25m, product.CurrentPrice);
+    }
+}

frontend/icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128">
+  <rect x="10" y="10" width="108" height="108" fill="#4CAF50" rx="20"/>
+  <text x="64" y="80" font-family="Arial" font-size="60" fill="white" text-anchor="middle">$</text>
+</svg>

frontend/project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="MyBiz - Economic Simulator"
+run/main_scene="res://scenes/main.tscn"
+config/features=PackedStringArray("4.0", "Forward Plus")
+config/icon="res://icon.svg"
+
+[display]
+
+window/size/viewport_width=1280
+window/size/viewport_height=720
+window/stretch/mode="canvas_items"
+
+[input]
+
+move_up={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":87,"key_label":0,"unicode":119,"echo":false,"script":null)
+]
+}
+move_down={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":83,"key_label":0,"unicode":115,"echo":false,"script":null)
+]
+}
+move_left={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":65,"key_label":0,"unicode":97,"echo":false,"script":null)
+]
+}
+move_right={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":68,"key_label":0,"unicode":100,"echo":false,"script":null)
+]
+}
+
+[layer_names]
+
+2d_physics/layer_1="Default"
+2d_physics/layer_2="Buildings"
+2d_physics/layer_3="UI"
+
+[rendering]
+
+renderer/rendering_method="forward_plus"

frontend/scenes/main.tscn

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+<?xml version="1.0" encoding="UTF-8"?>
+<scene format="3" uid="1" namespaced="false" unique_name_in_tree="true">
+<node name="Main" type="Node2D">
+    <node name="GameManager" instance="res://scripts/core/GameManager.cs" parent="." index="0"/>
+    <node name="UI" type="CanvasLayer" parent="." index="1">
+        <node name="TopBar" type="Panel" parent="UI">
+            <node name="HBoxContainer" type="HBoxContainer" parent="TopBar">
+                <node name="MoneyLabel" type="Label" parent="HBoxContainer"/>
+                <node name="DateLabel" type="Label" parent="HBoxContainer"/>
+            </node>
+        </node>
+    </node>
+</node>
+</scene>

frontend/scripts/core/GameData.cs

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+using Godot;
+
+[GlobalClass]
+public partial class GameData : Resource
+{
+    [Export] public string CompanyName { get; set; } = "My Company";
+    [Export] public int StartYear { get; set; } = 1980;
+    [Export] public decimal StartingCash { get; set; } = 100000m;
+    
+    // Настройки карты
+    [Export] public int CityCount { get; set; } = 10;
+    [Export] public bool EnableImports { get; set; } = true;
+}

frontend/scripts/core/GameManager.cs

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+using Godot;
+
+/// <summary>
+/// Менеджер игры - управляет состоянием игры
+/// </summary>
+public partial class GameManager : Node
+{
+    public static GameManager Instance { get; private set; } = null!;
+    
+    [Signal] public delegate void MoneyChangedEventHandler(decimal newAmount);
+    [Signal] public delegate void DateChangedEventHandler(int year, int month, int day);
+    
+    public decimal Money { get; private set; } = 100000m;
+    public int GameYear { get; private set; } = 1980;
+    public int GameMonth { get; private set; } = 1;
+    public int GameDay { get; private set; } = 1;
+    
+    public override void _Ready()
+    {
+        if (Instance != null && Instance != this)
+        {
+            QueueFree();
+            return;
+        }
+        
+        Instance = this;
+    }
+    
+    public void AddMoney(decimal amount)
+    {
+        Money += amount;
+        EmitSignal(SignalName.MoneyChanged, Money);
+    }
+    
+    public void SpendMoney(decimal amount)
+    {
+        if (Money >= amount)
+        {
+            Money -= amount;
+            EmitSignal(SignalName.MoneyChanged, Money);
+        }
+    }
+    
+    public void AdvanceTime(int ticks)
+    {
+        GameDay += ticks;
+        if (GameDay > 30)
+        {
+            GameDay = 1;
+            GameMonth++;
+            if (GameMonth > 12)
+            {
+                GameMonth = 1;
+                GameYear++;
+            }
+        }
+        EmitSignal(SignalName.DateChanged, GameYear, GameMonth, GameDay);
+    }
+}

frontend/scripts/core/Main.cs

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+using Godot;
+
+public partial class Main : Node2D
+{
+    public override void _Ready()
+    {
+        GD.Print("MyBiz - Game Started!");
+    }
+
+    public override void _Process(double delta)
+    {
+    }
+}

frontend/scripts/ui/GameUI.cs

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+using Godot;
+
+/// <summary>
+/// Базовый класс для всех UI элементов
+/// </summary>
+public partial class GameUI : Control
+{
+    protected GameManager GameManager => GameManager.Instance;
+    
+    public override void _Ready()
+    {
+        ConnectSignals();
+    }
+    
+    protected virtual void ConnectSignals()
+    {
+        if (GameManager != null)
+        {
+            GameManager.MoneyChanged += OnMoneyChanged;
+            GameManager.DateChanged += OnDateChanged;
+        }
+    }
+    
+    protected virtual void OnMoneyChanged(decimal newAmount) { }
+    protected virtual void OnDateChanged(int year, int month, int day) { }
+    
+    public override void _ExitTree()
+    {
+        if (GameManager != null)
+        {
+            GameManager.MoneyChanged -= OnMoneyChanged;
+            GameManager.DateChanged -= OnDateChanged;
+        }
+    }
+}