Refactor Customer and User Repository Methods for ObjectID Handling

- Updated GetByIDs methods in customer and user repositories to convert string IDs to bson.ObjectID, ensuring proper handling of MongoDB object IDs.
- Enhanced error handling for ID conversion to provide clearer feedback when invalid IDs are provided.
- Modified notification service calls in customer and user services to use context.Background() for asynchronous email sending, improving concurrency management.
- Ensured consistent handling of company IDs in the customer repository for retrieving customers by companies.

internal/notification/handler.go

@@ -1,6 +1,8 @@
 package notification
 
 import (
+	"context"
+
 	"github.com/asaskevich/govalidator"
 	"github.com/labstack/echo/v4"
 
@@ -48,7 +50,7 @@ func (h *NotificationHandler) Send(c echo.Context) error {
 	}
 
 	// Send notification
-	h.service.Send(c.Request().Context(), &req)
+	go h.service.Send(context.Background(), &req)
 
 	return response.Created(c, nil, "Notification sent successfully")
 }