various: add links_extracted_at field to track markdown link extraction time

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Id13c6243de4c0f4fa5a87a13402379906a6a6964

crates/pinakes-server/src/dto.rs

@@ -34,6 +34,9 @@ pub struct MediaResponse {
 
     pub created_at: DateTime<Utc>,
     pub updated_at: DateTime<Utc>,
+
+    // Markdown links
+    pub links_extracted_at: Option<DateTime<Utc>>,
 }
 
 #[derive(Debug, Serialize)]
@@ -562,6 +565,9 @@ impl From<pinakes_core::model::MediaItem> for MediaResponse {
 
             created_at: item.created_at,
             updated_at: item.updated_at,
+
+            // Markdown links
+            links_extracted_at: item.links_extracted_at,
         }
     }
 }