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

MikrocopApi/Mappers/AuthMappingExtensions.cs

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+using MikrocopApi.Dtos;
+
+namespace MikrocopApi.Mappers;
+
+public static class AuthMappingExtensions
+{
+    public static LoginResponseDto ToDto(this (string AccessToken, DateTime ExpiresAtUtc) token)
+    {
+        return new LoginResponseDto
+        {
+            AccessToken = token.AccessToken,
+            ExpiresAtUtc = token.ExpiresAtUtc,
+            TokenType = "Bearer"
+        };
+    }
+
+    public static ValidatePasswordResponseDto ToDto(this bool isValid)
+    {
+        return new ValidatePasswordResponseDto
+        {
+            IsValid = isValid
+        };
+    }
+}

MikrocopApi/Mappers/UserMappingExtensions.cs

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+using MikrocopApi.Dtos;
+using MikrocopDb.Entities;
+
+namespace MikrocopApi.Mappers;
+
+public static class UserMappingExtensions
+{
+    public static UserEntity ToEntity(this CreateUserDto dto)
+    {
+        return new UserEntity
+        {
+            Id = Guid.NewGuid(),
+            UserName = dto.UserName.Trim(),
+            FullName = dto.FullName.Trim(),
+            Email = dto.Email.Trim(),
+            MobileNumber = dto.MobileNumber.Trim(),
+            Language = dto.Language.Trim(),
+            Culture = dto.Culture.Trim(),
+            PasswordHash = string.Empty,
+            PasswordSalt = string.Empty
+        };
+    }
+
+    public static void ApplyFromDto(this UserEntity entity, UpdateUserDto dto)
+    {
+        entity.UserName = dto.UserName.Trim();
+        entity.FullName = dto.FullName.Trim();
+        entity.Email = dto.Email.Trim();
+        entity.MobileNumber = dto.MobileNumber.Trim();
+        entity.Language = dto.Language.Trim();
+        entity.Culture = dto.Culture.Trim();
+    }
+
+    public static UserDto ToDto(this UserEntity entity)
+    {
+        return new UserDto
+        {
+            Id = entity.Id,
+            UserName = entity.UserName,
+            FullName = entity.FullName,
+            Email = entity.Email,
+            MobileNumber = entity.MobileNumber,
+            Language = entity.Language,
+            Culture = entity.Culture
+        };
+    }
+}