Reorganize scripts into subfolders by responsibility

Move scripts under Assets/Scripts/ into Components, GameMode, Helper,
Network, Enum, Struct and ScriptableObject folders. Pure file moves
(plus folder .meta files); no code changes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scripts/GameMode/GameMode.cs

@@ -0,0 +1,49 @@
+/// <summary>
+/// Base class for a high-level game mode handled by <see cref="GameModeManager"/>.
+/// Modes are plain C# classes (not MonoBehaviours); Enter/Exit/Tick are driven
+/// manually by the manager. Derive from this and register an instance in
+/// GameModeManager.BuildModes().
+/// </summary>
+public abstract class GameMode
+{
+    protected GameModeManager Manager { get; private set; }
+
+    /// <summary>Human-readable name (shown in logs).</summary>
+    public abstract string DisplayName { get; }
+
+    internal void Bind(GameModeManager manager) => Manager = manager;
+
+    /// <summary>Called once when this mode becomes active.</summary>
+    public virtual void Enter() { }
+
+    /// <summary>Called once when this mode stops being active.</summary>
+    public virtual void Exit() { }
+
+    /// <summary>Called every frame while this mode is active.</summary>
+    public virtual void Tick() { }
+
+    /// <summary>Enables the player component and sets whether it accepts movement input.</summary>
+    protected void SetPlayerControl(bool controlEnabled)
+    {
+        if (Manager.Player)
+        {
+            Manager.Player.enabled = true;
+            Manager.Player.ControlEnabled = controlEnabled;
+        }
+    }
+
+    /// <summary>Toggles painting on the mesh painter.</summary>
+    protected void SetPainting(bool on)
+    {
+        if (Manager.Painter)
+            Manager.Painter.PaintingEnabled = on;
+    }
+
+    /// <summary>Enables/disables the orbit camera input component. Off while a dedicated camera rig is
+    /// live: the orbit rig would otherwise keep grabbing the cursor and reading the mouse every frame.</summary>
+    protected void SetOrbitInputEnabled(bool on)
+    {
+        if (Manager.CameraInput)
+            Manager.CameraInput.enabled = on;
+    }
+}