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

feat(emailer): add Postmark and Resend providers

backend/Modules/Identity/Handlers/ResetPassword.cs

@@ -0,0 +1,55 @@
+using Hutopy.Modules.Identity.Data;
+
+namespace Hutopy.Modules.Identity.Handlers;
+
+[PublicAPI]
+public record ResetPasswordRequest(
+    string Email,
+    string Token,
+    string NewPassword);
+
+[PublicAPI]
+public class ResetPasswordHandler(
+    UserManager userManager)
+    : Endpoint<ResetPasswordRequest>
+{
+    public override void Configure()
+    {
+        AllowAnonymous();
+        Post("/api/users/reset-password");
+        Options(o => o.WithTags("Users"));
+    }
+
+    public override async Task HandleAsync(
+        ResetPasswordRequest request,
+        CancellationToken ct)
+    {
+        // Find user by email
+        var user = await userManager.FindByEmailAsync(request.Email);
+        if (user is null)
+        {
+            await SendStringAsync(
+                "Invalid request",
+                400,
+                cancellation: ct);
+            return;
+        }
+
+        // Reset password with token
+        var result = await userManager.ResetPasswordAsync(
+            user,
+            request.Token,
+            request.NewPassword);
+
+        if (!result.Succeeded)
+        {
+            await SendStringAsync(
+                "Invalid or expired token",
+                400,
+                cancellation: ct);
+            return;
+        }
+
+        await SendOkAsync(ct);
+    }
+}