Added ASP.NET backend with SQLite

backend/MuiCharts.Contracts/MuiCharts.Contracts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<ItemGroup>
+		<ProjectReference Include="..\MuiCharts.Domain\MuiCharts.Domain.csproj" />
+	</ItemGroup>
+
+	<PropertyGroup>
+		<TargetFramework>net8.0</TargetFramework>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+	</PropertyGroup>
+
+</Project>

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
+);

backend/MuiCharts.Contracts/Track/TrackResponse.cs

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+using MuiCharts.Domain.Enums;
+
+namespace MuiCharts.Contracts.Track;
+
+/// <summary>
+/// Represents a response object for a track.
+/// </summary>
+public record TrackResponse(
+	int FirstId,
+	int SecondId,
+	int Distance,
+	Surface Surface,
+	MaxSpeed MaxSpeed
+);

backend/MuiCharts.Contracts/Track/UpsertTrackRequest.cs

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+using System.ComponentModel.DataAnnotations;
+using MuiCharts.Domain.Enums;
+
+namespace MuiCharts.Contracts.Track;
+
+/// <summary>
+/// Represents a request to upsert a track.
+/// </summary>
+public record UpsertTrackRequest(
+	[Range(0, int.MaxValue)] int FirstId,
+	[Range(0, int.MaxValue)] int SecondId,
+	[Range(1, int.MaxValue)] int Distance,
+	Surface Surface,
+	MaxSpeed MaxSpeed
+);