many fixes and improvements - rework for modules/ and common/

feat(emailer): add Postmark and Resend providers

backend/Modules/Identity/Models/Result.cs

@@ -0,0 +1,49 @@
+namespace Hutopy.Modules.Identity.Models;
+
+public class Result(
+    bool succeeded, 
+    IEnumerable<string> errors)
+{
+    public bool Succeeded { get; init; } = succeeded;
+    public string[] Errors { get; init; } = errors.ToArray();
+    
+    public static Result Success()
+    {
+        return new Result(true, Array.Empty<string>());
+    }
+
+    public static Result Failure(IEnumerable<string> errors)
+    {
+        return new Result(false, errors);
+    }
+}
+
+public class Result<T>(
+    T? value,
+    bool succeeded, 
+    IEnumerable<string> errors)
+{
+    public bool Succeeded { get; init; } = succeeded;
+    public string[] Errors { get; init; } = errors.ToArray();
+    public T? Value { get; set; } = value;
+    
+    public T GetValueOrDefault()
+    {
+        return Value ?? default(T)!;
+    }
+    
+    public string GetErrorsAsString()
+    {
+        return Errors.Length == 0 ? string.Empty : string.Join(", ", Errors);
+    }
+
+    public static Result<T> Success(T value)
+    {
+        return new Result<T>(value, true, Array.Empty<string>());
+    }
+
+    public static Result<T> Failure(T value, IEnumerable<string> errors)
+    {
+        return new Result<T>(value, false, errors);
+    }
+}

backend/Modules/Identity/Models/RoleModel.cs

@@ -0,0 +1,7 @@
+namespace Hutopy.Modules.Identity.Models;
+
+public class RoleModel
+{
+    public Guid Id { get; set; }
+    public string? Name { get; set; }
+}

backend/Modules/Identity/Models/UserDto.cs

@@ -0,0 +1,16 @@
+namespace Hutopy.Modules.Identity.Models;
+
+public class UserDto
+{
+    public Guid Id { get; init; }
+    public IList<string> UserRoles { get; init; } = [];
+    public string Username { get; init; } = null!;
+    public string? Alias { get; init; }
+    public string? PortraitUrl { get; init; }
+    public string? Firstname { get; init; }
+    public string? Lastname { get; init; }
+    public string? Email { get; init; }
+    public string? PhoneNumber { get; init; }
+    public DateTime? BirthDate { get; init; }
+    public string? Address { get; init; }
+}

backend/Modules/Identity/Models/UserModel.cs

@@ -0,0 +1,15 @@
+namespace Hutopy.Modules.Identity.Models;
+
+public class UserModel
+{
+    public Guid Id { get; set; }
+    public string Username { get; init; } = null!;
+    public string? Alias { get; init; }
+    public string? PortraitUrl { get; init; }
+    public string? Firstname { get; init; }
+    public string? Lastname { get; init; }
+    public string? Email { get; init; }
+    public string? PhoneNumber { get; init; }
+    public DateTime? BirthDate { get; init; }
+    public string? Address { get; init; }
+}