Update Notification API Endpoints and Documentation

- Changed the endpoint for marking notifications as seen to improve clarity and consistency in the API structure.
- Updated the endpoint for marking all notifications as seen to a more descriptive path.
- Reflected these changes in the Swagger documentation, ensuring accurate representation of the updated API endpoints for consumers.

cmd/web/docs/swagger.yaml

@@ -4743,7 +4743,7 @@ paths:
       summary: Get notifications for the user
       tags:
       - Notification
-  /api/v1/notifications/all-seen/{user_id}:
+  /api/v1/notifications/mark:
     get:
       consumes:
       - application/json
@@ -4774,7 +4774,7 @@ paths:
       summary: Mark all notifications as seen for a user
       tags:
       - Notification
-  /api/v1/notifications/mark-seen/{id}:
+  /api/v1/notifications/mark/{id}:
     get:
       consumes:
       - application/json