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/docs.go

@@ -5529,7 +5529,7 @@ const docTemplate = `{
                 }
             }
         },
-        "/api/v1/notifications/all-seen/{user_id}": {
+        "/api/v1/notifications/mark": {
             "get": {
                 "security": [
                     {
@@ -5578,7 +5578,7 @@ const docTemplate = `{
                 }
             }
         },
-        "/api/v1/notifications/mark-seen/{id}": {
+        "/api/v1/notifications/mark/{id}": {
             "get": {
                 "security": [
                     {