style: resolve CS8618 and CS1998 warnings

- Add required modifier to non-nullable properties in SpeakerCommand, OrganizerCommand, and EventCommand
- Add await Task.CompletedTask to placeholder async methods in controllers to resolve async method lacks await warnings

Author: alysonsz

EventFlow.Application/Commands/EventCommand.cs

@@ -3,9 +3,9 @@ namespace EventFlow.Application.Commands;
 public class EventCommand
 {
     public int Id { get; private set; }
-    public string Title { get; set; }
+    public required string Title { get; set; }
     public string? Description { get; set; }
     public DateTime Date { get; set; }
-    public string Location { get; set; }
+    public required string Location { get; set; }
     public int OrganizerId { get; set; }
 }

EventFlow.Application/Commands/OrganizerCommand.cs

@@ -2,6 +2,6 @@ namespace EventFlow.Application.Commands;
 
 public class OrganizerCommand
 {
-    public string Name { get; set; }
-    public string Email { get; set; }
+    public required string Name { get; set; }
+    public required string Email { get; set; }
 }

EventFlow.Application/Commands/SpeakerCommand.cs

@@ -4,8 +4,8 @@ namespace EventFlow.Application.Commands;
 
 public class SpeakerCommand
 {
-    public string Name { get; set; }
-    public string Email { get; set; }
+    public required string Name { get; set; }
+    public required string Email { get; set; }
     public string? Biography { get; set; }
 
     [JsonIgnore]

EventFlow.Presentation/Controllers/OrganizerController.cs

@@ -31,7 +31,7 @@ public async Task<IActionResult> PostAsync([FromBody] CreateOrganizerCommand com
     public async Task<IActionResult> RegisterParticipantAsync(int organizerId, int eventId)
     {
         // TODO: Implementar RegisterOrganizerToEventCommand
-        // Por enquanto mantendo o service call ou pode ser implementado depois
+        await Task.CompletedTask;
         return Ok(new { message = "Evento vinculado ao organizador com sucesso." });
     }
 

EventFlow.Presentation/Controllers/ParticipantController.cs

@@ -31,7 +31,7 @@ public async Task<IActionResult> PostAsync([FromBody] CreateParticipantCommand c
     public async Task<IActionResult> RegisterParticipantAsync(int eventId, int participantId)
     {
         // TODO: Implementar RegisterParticipantToEventCommand
-        // Por enquanto mantendo retorno de sucesso ou pode ser implementado depois
+        await Task.CompletedTask;
         return Ok(new { message = "Participante vinculado ao evento com sucesso." });
     }
 

EventFlow.Presentation/Controllers/SpeakerController.cs

@@ -31,7 +31,7 @@ public async Task<IActionResult> PostAsync([FromBody] CreateSpeakerCommand comma
     public async Task<IActionResult> RegisterToEventAsync(int speakerId, int eventId)
     {
         // TODO: Implementar RegisterSpeakerToEventCommand
-        // Por enquanto mantendo retorno de sucesso ou pode ser implementado depois
+        await Task.CompletedTask;
         return Ok(new { message = "Palestrante vinculado com sucesso ao evento." });
     }