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

feat(emailer): add Postmark and Resend providers

backend/Modules/Identity/Data/IdentityService.cs

@@ -0,0 +1,60 @@
+using System.Security.Claims;
+using Hutopy.Modules.Identity.Models;
+
+namespace Hutopy.Modules.Identity.Data;
+
+public class IdentityService(
+    UserManager userManager,
+    IHttpContextAccessor contextAccessor
+)
+{
+    public async Task<UserModel?> GetCurrentUserAsync()
+    {
+        var currentUserId = contextAccessor.HttpContext?.User.FindFirst(ClaimTypes.NameIdentifier)?.Value;
+        if (string.IsNullOrEmpty(currentUserId))
+        {
+            return null;
+        }
+
+        UserModel? ret;
+        var user = await userManager.FindByIdAsync(currentUserId);
+
+        if (user == null) ret = null;
+        else
+        {
+            var userModel = new UserModel
+            {
+                Id = user.Id,
+                Username = user.UserName ?? string.Empty,
+                PhoneNumber = user.PhoneNumber ?? string.Empty,
+                Email = user.Email ?? string.Empty,
+                PortraitUrl = user.PortraitUrl,
+                Alias = user.Alias,
+                Firstname = user.Firstname,
+                Lastname = user.Lastname,
+                BirthDate = user.BirthDate,
+                Address = user.Address
+            };
+
+            ret = userModel;
+        }
+
+        return ret;
+    }
+
+    public async Task<IList<string>> GetCurrentUserRolesAsync()
+    {
+        var currentUserModel = await GetCurrentUserAsync();
+
+        if (currentUserModel is null) return [];
+        
+        var currentUser = await userManager.FindByIdAsync(currentUserModel.Id.ToString());
+
+        if (currentUser is null) return [];
+
+        var userRoles = await userManager.GetRolesAsync(currentUser);
+
+        return userRoles;
+    }
+
+}