feat(backend): add communication, tester, admin and middleman modules

Implement step 17 modules: threads/messages, notifications with automation (submission.created, idea.created, grant_call.opened), innovation test feedback, admin panel (submissions, verify, metrics, grant call status), Middleman adaptation and partnerships. Split multi-type files into one type per file and replace object-valued dictionaries with string-valued maps in data contracts (migrations 0006/0007).

backend/Application/Abstractions/ITokenService.cs

@@ -2,9 +2,8 @@ using TarninaHub.Application.Models;
 
 namespace TarninaHub.Application.Abstractions;
 
+
 public interface ITokenService
 {
     TokenResult CreateToken(UserAccount user);
 }
-
-public sealed record TokenResult(string AccessToken, DateTimeOffset ExpiresAt);