feat: add date_taken field to media model and update related functionalities

libertas_api/migrations/20251104042053_add_media_date_taken.sql

@@ -0,0 +1,4 @@
+ALTER TABLE media
+ADD COLUMN date_taken TIMESTAMPTZ;
+
+CREATE INDEX idx_media_date_taken ON media (date_taken);

libertas_api/src/services/media_service.rs

@@ -259,6 +259,7 @@ impl MediaServiceImpl {
             extracted_location: None,
             width: None,
             height: None,
+            date_taken: None,
         };
 
         self.repo.create(&media_model).await?;