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

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;
+        }
+    }
+}