Refactor project structure and update documentation. Replace PixiJS with plain DOM for UI rendering, enhance README with game features, and revise protocol documentation for HTTP API. Remove unused files and streamline client code for better maintainability.

src/HSchool.Simulation/SimulationOptions.cs

@@ -1,23 +1,33 @@
-namespace HSchool.Simulation;
-
-/// <summary>Tunables of the authoritative simulation. Bound from the <c>Simulation</c> config section.</summary>
-public sealed class SimulationOptions
-{
-    public const string SectionName = "Simulation";
-
-    /// <summary>Fixed simulation steps per second.</summary>
-    public int TickRate { get; set; } = 20;
-
-    public float WorldWidth { get; set; } = 1600f;
-
-    public float WorldHeight { get; set; } = 900f;
-
-    public float PlayerSpeed { get; set; } = 260f;
-
-    public float PlayerRadius { get; set; } = 18f;
-
-    /// <summary>Length of one fixed step.</summary>
-    public float FixedDeltaTime => 1f / TickRate;
-
-    public TimeSpan TickInterval => TimeSpan.FromSeconds(1d / TickRate);
-}
+namespace HSchool.Simulation;
+
+/// <summary>Tunables of the authoritative simulation. Bound from the <c>Simulation</c> config section.</summary>
+public sealed class SimulationOptions
+{
+    public const string SectionName = "Simulation";
+
+    private DateTime _defaultStartDate = new(2012, 4, 3, 6, 0, 0, DateTimeKind.Utc);
+
+    /// <summary>Fixed simulation steps per second.</summary>
+    public int TickRate { get; set; } = 20;
+
+    /// <summary>How many schools may exist at the same time.</summary>
+    public int MaxSchools { get; set; } = 6;
+
+    /// <summary>Base speed of the game clock: real seconds are multiplied by this many game minutes.</summary>
+    public double GameMinutesPerRealSecond { get; set; } = 5d;
+
+    /// <summary>Prefilled start of a new school; the client shows it in the creation form.</summary>
+    public DateTime DefaultStartDate
+    {
+        get => _defaultStartDate;
+
+        // Configuration binding yields Kind=Unspecified, which serializes without a "Z" and makes
+        // the browser read the date in its own time zone. The game calendar is always UTC.
+        set => _defaultStartDate = DateTime.SpecifyKind(value, DateTimeKind.Utc);
+    }
+
+    /// <summary>Length of one fixed step.</summary>
+    public double FixedDeltaTime => 1d / TickRate;
+
+    public TimeSpan TickInterval => TimeSpan.FromSeconds(1d / TickRate);
+}