Upgrade to .NET 10 and finalize foundation scaffold

Domain/AppState.cs

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+namespace GameList.Domain;
+
+public class AppState
+{
+    public int Id { get; set; } = 1;
+    public Phase CurrentPhase { get; set; } = Phase.Suggest;
+    public DateTimeOffset UpdatedAt { get; set; } = DateTimeOffset.UtcNow;
+}

Domain/Phase.cs

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+namespace GameList.Domain;
+
+public enum Phase
+{
+    Suggest = 0,
+    Reveal = 1,
+    Vote = 2,
+    Results = 3
+}

Domain/Player.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace GameList.Domain;
+
+public class Player
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [MaxLength(64)]
+    public string? DisplayName { get; set; }
+
+    public DateTimeOffset CreatedAt { get; set; } = DateTimeOffset.UtcNow;
+
+    public ICollection<Suggestion> Suggestions { get; set; } = new List<Suggestion>();
+    public ICollection<Vote> Votes { get; set; } = new List<Vote>();
+}

Domain/Suggestion.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace GameList.Domain;
+
+public class Suggestion
+{
+    public int Id { get; set; }
+
+    [Required]
+    public Guid PlayerId { get; set; }
+    public Player? Player { get; set; }
+
+    [Required]
+    [MaxLength(100)]
+    public string Name { get; set; } = string.Empty;
+
+    [MaxLength(50)]
+    public string? Genre { get; set; }
+
+    [MaxLength(500)]
+    public string? Description { get; set; }
+
+    [MaxLength(2048)]
+    public string? ScreenshotUrl { get; set; }
+
+    [MaxLength(2048)]
+    public string? YoutubeUrl { get; set; }
+
+    public DateTimeOffset CreatedAt { get; set; } = DateTimeOffset.UtcNow;
+
+    public ICollection<Vote> Votes { get; set; } = new List<Vote>();
+}

Domain/Vote.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace GameList.Domain;
+
+public class Vote
+{
+    public int Id { get; set; }
+
+    [Required]
+    public Guid PlayerId { get; set; }
+    public Player? Player { get; set; }
+
+    [Required]
+    public int SuggestionId { get; set; }
+    public Suggestion? Suggestion { get; set; }
+
+    [Range(0, 10)]
+    public int Score { get; set; }
+
+    public DateTimeOffset CreatedAt { get; set; } = DateTimeOffset.UtcNow;
+}