Added ASP.NET backend with SQLite

backend/MuiCharts.Contracts/Point/GetPointsRequest.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace MuiCharts.Contracts.Point;
+
+/// <summary>
+/// Represents a request to get a collection of points.
+/// </summary>
+public record class GetPointsRequest(
+	[Range(1, int.MaxValue)]
+	int Page = 1,
+	[Range(1, int.MaxValue)]
+	int Count = 50
+);

backend/MuiCharts.Contracts/Point/GetPointsResponse.cs

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+namespace MuiCharts.Contracts.Point;
+
+/// <summary>
+/// Represents the response object for retrieving points.
+/// </summary>
+public record class GetPointsResponse(
+	PointResponse[] Points,
+	int TotalCount,
+	int Count,
+	int Page
+);

backend/MuiCharts.Contracts/Point/PointResponse.cs

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+namespace MuiCharts.Contracts.Point;
+
+/// <summary>
+/// Represents a response object containing information about a point.
+/// </summary>
+public record PointResponse(
+	int Id,
+	string Name,
+	int Height
+);

backend/MuiCharts.Contracts/Point/UpsertPointRequest.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace MuiCharts.Contracts.Point;
+
+/// <summary>
+/// Represents a request to upsert a point.
+/// </summary>
+public record UpsertPointRequest(
+	[MinLength(1)] string Name,
+	int Height
+);