Add backend structure with Docker support and initial configuration files

Signed-off-by: Dmitrii <computer@yawaflua.tech>

Took 4 hours 25 minutes

backend/SpMega.Backend/Persistent/Database/AppDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+using MongoDB.EntityFrameworkCore.Extensions;
+using SpMega.Backend.Persistent.Models.Transactions;
+using SpMega.Backend.Persistent.Models.Users;
+
+namespace SpMega.Backend.Persistent.Database;
+
+public class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
+{
+    internal DbSet<Transaction> Transactions { get; set; }
+    internal DbSet<User> Users { get; set; }
+    internal DbSet<UserSession> UserSessions { get; set; }
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {
+        
+    }
+    
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+        
+
+    }
+}

backend/SpMega.Backend/Persistent/Models/DTO/MojangDTO.cs

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+namespace SpMega.Backend.Persistent.Models.DTO;
+
+public class PropertyDto
+{
+    public string Name { get; set; }
+    public string Value { get; set; }
+    public string Signature { get; set; }
+}
+
+public class MojangDto
+{
+    public string Id { get; set; }
+    public string Name { get; set; }
+    public List<PropertyDto> Properties { get; set; }
+}

backend/SpMega.Backend/Persistent/Models/DTO/UserAccountDTO.cs

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+using SPWorldsApi.Types.Interfaces;
+
+namespace SpMega.Backend.Persistent.Models.DTO;
+
+public class UserAccountDTO : IUserAccount
+{
+    public string id { get; set; }
+    public string username { get; set; }
+    public string minecraftUUID { get; set; }
+    public string status { get; set; }
+    public List<string> roles { get; set; }
+    public ICity city { get; set; }
+    public List<IUserCard> cards { get; set; }
+    public DateTime createdAt { get; set; }
+}

backend/SpMega.Backend/Persistent/Models/Transactions/Transaction.cs

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+using System.Text.Json.Serialization;
+using SpMega.Backend.Persistent.Models.Users;
+
+namespace SpMega.Backend.Persistent.Models.Transactions;
+
+public class Transaction
+{
+    public Guid Id { get; set; }
+    public string ShortId { get; set; } = Program.GenerateRandomString(8);
+    public string ReceiverName { get; set; }
+    public string ReceiverCardNumber { get; set; }
+    [JsonIgnore] public User Sender { get; set; }
+    public string SenderCardNumber { get; set; }
+    
+    public int Amount { get; set; } = 0;
+    public string Comment { get; set; } = "";
+    
+    public DateTime TransactionDate { get; set; } = DateTime.UtcNow;
+}

backend/SpMega.Backend/Persistent/Models/Users/Card.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace SpMega.Backend.Persistent.Models.Users;
+
+[Owned]
+public class Card
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; }
+    public string SpworldsID { get; set; }
+    public string Token { get; set; }
+    
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; }
+    public DateTime? DeletedAt { get; set; }
+    public bool IsDeleted { get; set; } = false;
+}

backend/SpMega.Backend/Persistent/Models/Users/User.cs

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+using SpMega.Backend.Persistent.Models.Transactions;
+
+namespace SpMega.Backend.Persistent.Models.Users;
+
+public class User
+{
+    public Guid Id { get; set; }
+    public string Username { get; set; }
+    public string Token { get; set; }
+
+    public List<Card> Cards { get; set; } = [];
+    public List<Transaction> Transactions { get; set; } = [];
+    
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; }
+    public DateTime? DeletedAt { get; set; }
+    public bool IsDeleted { get; set; } = false;
+}

backend/SpMega.Backend/Persistent/Models/Users/UserSession.cs

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+namespace SpMega.Backend.Persistent.Models.Users;
+
+public class UserSession
+{
+    public Guid Id { get; set; }
+    public string Token { get; set; }
+    public User? User { get; set; } = null;
+    public Guid UserId { get; set; }
+    public string UserName { get; set; }
+    
+    public DateTime CreatedAt { get; init; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; }
+    public DateTime? DeletedAt { get; set; }
+    public bool IsDeleted { get; set; } = false;
+}