feat: nullable projectId, new ticket categories, improved create form

backend/src/main/java/com/srsystem/dto/CreateTicketRequest.java

@@ -2,11 +2,12 @@ package com.srsystem.dto;
 
 import com.srsystem.entity.enums.TicketCategory;
 import com.srsystem.entity.enums.TicketPriority;
+import jakarta.annotation.Nullable;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 
 public record CreateTicketRequest(
-        @NotNull Long projectId,
+        @Nullable Long projectId,
         @NotNull TicketCategory category,
         @NotNull TicketPriority priority,
         @NotBlank String title,