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

MikrocopApi/Dtos/CreateUserDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace MikrocopApi.Dtos;
+
+public sealed class CreateUserDto
+{
+    [Required]
+    [StringLength(100, MinimumLength = 3)]
+    public string UserName { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(200, MinimumLength = 2)]
+    public string FullName { get; set; } = string.Empty;
+
+    [Required]
+    [EmailAddress]
+    [StringLength(200)]
+    public string Email { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(30, MinimumLength = 7)]
+    [RegularExpression(@"^\+?[0-9\- ]+$", ErrorMessage = "Mobile number contains invalid characters.")]
+    public string MobileNumber { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(10, MinimumLength = 2)]
+    [RegularExpression(@"^[a-zA-Z]{2,10}$", ErrorMessage = "Language must contain only letters.")]
+    public string Language { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(20, MinimumLength = 2)]
+    [RegularExpression(@"^[a-zA-Z]{2,10}(-[a-zA-Z]{2,10})?$", ErrorMessage = "Culture format is invalid.")]
+    public string Culture { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(128, MinimumLength = 8)]
+    public string Password { get; set; } = string.Empty;
+}

MikrocopApi/Dtos/LoginRequestDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace MikrocopApi.Dtos;
+
+public sealed class LoginRequestDto
+{
+    [Required]
+    [StringLength(100, MinimumLength = 3)]
+    public string UserName { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(128, MinimumLength = 8)]
+    public string Password { get; set; } = string.Empty;
+}

MikrocopApi/Dtos/LoginResponseDto.cs

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+namespace MikrocopApi.Dtos;
+
+public sealed class LoginResponseDto
+{
+    public required string AccessToken { get; init; }
+    public required DateTime ExpiresAtUtc { get; init; }
+    public required string TokenType { get; init; }
+}

MikrocopApi/Dtos/UpdateUserDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace MikrocopApi.Dtos;
+
+public sealed class UpdateUserDto
+{
+    [Required]
+    [StringLength(100, MinimumLength = 3)]
+    public string UserName { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(200, MinimumLength = 2)]
+    public string FullName { get; set; } = string.Empty;
+
+    [Required]
+    [EmailAddress]
+    [StringLength(200)]
+    public string Email { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(30, MinimumLength = 7)]
+    [RegularExpression(@"^\+?[0-9\- ]+$", ErrorMessage = "Mobile number contains invalid characters.")]
+    public string MobileNumber { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(10, MinimumLength = 2)]
+    [RegularExpression(@"^[a-zA-Z]{2,10}$", ErrorMessage = "Language must contain only letters.")]
+    public string Language { get; set; } = string.Empty;
+
+    [Required]
+    [StringLength(20, MinimumLength = 2)]
+    [RegularExpression(@"^[a-zA-Z]{2,10}(-[a-zA-Z]{2,10})?$", ErrorMessage = "Culture format is invalid.")]
+    public string Culture { get; set; } = string.Empty;
+
+    [StringLength(128, MinimumLength = 8)]
+    public string? Password { get; set; }
+}

MikrocopApi/Dtos/UserDto.cs

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+namespace MikrocopApi.Dtos;
+
+public sealed class UserDto
+{
+    public Guid Id { get; init; }
+    public required string UserName { get; init; }
+    public required string FullName { get; init; }
+    public required string Email { get; init; }
+    public required string MobileNumber { get; init; }
+    public required string Language { get; init; }
+    public required string Culture { get; init; }
+}

MikrocopApi/Dtos/ValidatePasswordRequestDto.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace MikrocopApi.Dtos;
+
+public sealed class ValidatePasswordRequestDto
+{
+    [Required]
+    [StringLength(128, MinimumLength = 8)]
+    public string Password { get; set; } = string.Empty;
+}

MikrocopApi/Dtos/ValidatePasswordResponseDto.cs

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+namespace MikrocopApi.Dtos;
+
+public sealed class ValidatePasswordResponseDto
+{
+    public bool IsValid { get; init; }
+}