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/HealthController.cs

@@ -4,6 +4,7 @@ namespace TarninaHub.Controllers;
 
 [ApiController]
 [Route("api/health")]
+
 public class HealthController : ControllerBase
 {
     [HttpGet]
@@ -12,5 +13,3 @@ public class HealthController : ControllerBase
         return Ok(new HealthResponse("ok"));
     }
 }
-
-public record HealthResponse(string Status);