fix: assign member hanya intern yg gk ada active project

src/modules/project/services/project.service.js

@@ -547,13 +547,30 @@ class ProjectService {
         return error(new NotFoundError("User not found or inactive"));
       }
 
+      if (user.role !== "intern") {
+        return error(
+          new ForbiddenError("Access denied: only interns can be assigned to projects")
+        );
+      }
+
+      const activeMemberships = await projectRepository.findActiveMembershipsByUserIds([id_user]);
+      if (activeMemberships.length > 0) {
+        const activeProj = activeMemberships[0].project;
+        if (activeMemberships[0].id_project === parseInt(id_project)) {
+          return error(new ConflictError("User is already an active member of this project"));
+        } else {
+          return error(
+            new ConflictError(
+              `User is already an active member of another project: ${activeProj?.project_name || "Unknown Project"}`
+            )
+          );
+        }
+      }
+
       const existingMembership = await projectRepository.findMembership(id_project, id_user);
 
       let membership;
       if (existingMembership) {
-        if (existingMembership.status === 'active') {
-          return error(new ConflictError("User is already an active member of this project"));
-        }
         membership = await projectRepository.updateMembershipStatus(existingMembership.id, 'active');
       } else {
         membership = await projectRepository.assignMember(id_project, id_user);