Add initial implementation of API, database, and user management components.

MikrocopApi/Services/Interfaces/IAuthService.cs

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+using MikrocopApi.Dtos;
+
+namespace MikrocopApi.Services;
+
+public interface IAuthService
+{
+    Task<LoginResponseDto> LoginAsync(LoginRequestDto request, CancellationToken cancellationToken = default);
+}

MikrocopApi/Services/Interfaces/IJwtTokenService.cs

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+using MikrocopDb.Entities;
+
+namespace MikrocopApi.Services;
+
+public interface IJwtTokenService
+{
+    (string AccessToken, DateTime ExpiresAtUtc) Generate(UserEntity user);
+}

MikrocopApi/Services/Interfaces/IPasswordHashingService.cs

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+namespace MikrocopApi.Services;
+
+public interface IPasswordHashingService
+{
+    (string Hash, string Salt) HashPassword(string password);
+    bool VerifyPassword(string password, string hashBase64, string saltBase64);
+}

MikrocopApi/Services/Interfaces/IUserService.cs

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+using MikrocopApi.Dtos;
+
+namespace MikrocopApi.Services;
+
+public interface IUserService
+{
+    Task<UserDto> CreateAsync(CreateUserDto request, CancellationToken cancellationToken = default);
+    Task UpdateAsync(Guid id, UpdateUserDto request, CancellationToken cancellationToken = default);
+    Task<UserDto> GetByIdAsync(Guid id, CancellationToken cancellationToken = default);
+    Task DeleteAsync(Guid id, CancellationToken cancellationToken = default);
+    Task<bool> ValidatePasswordAsync(Guid id, string password, CancellationToken cancellationToken = default);
+}