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/Controllers/MatchmakingController.cs

@@ -10,6 +10,7 @@ namespace TarninaHub.Controllers;
 [ApiVersion("1.0")]
 [Route("api/matchmaking")]
 [Authorize]
+
 public class MatchmakingController : ControllerBase
 {
     private readonly IMatchmakingService _matchmakingService;
@@ -28,5 +29,3 @@ public class MatchmakingController : ControllerBase
         return Ok(new MatchmakingReindexResponse(indexed));
     }
 }
-
-public sealed record MatchmakingReindexResponse(int Indexed);