Add Notification Filters for Seen and Priority

- Introduced new optional fields in the SearchForm for filtering notifications by 'seen' status and 'priority', enhancing the flexibility of notification retrieval.
- Updated the GetNotifications method in the notification service to accommodate the new filters, ensuring they are included in the query parameters.
- Enhanced the notification client to support the new filters in API requests, improving the overall functionality of the notification system.
- Updated API documentation with Swagger comments to reflect the new query parameters, ensuring clarity for API consumers.

pkg/notification/entities.go

@@ -187,6 +187,8 @@ type GetNotificationsRequest struct {
 	EventType string `json:"event_type,omitempty" valid:"optional"`
 	Type      string `json:"type,omitempty" valid:"optional"`
 	UserID    string `json:"user_id,omitempty" valid:"optional"`
+	Seen      *bool  `json:"seen,omitempty" valid:"optional"`
+	Priority  string `json:"priority,omitempty" valid:"optional"`
 	Page      int    `json:"page,omitempty" valid:"optional"`
 	PerPage   int    `json:"per_page,omitempty" valid:"optional"`
 }