refactor(services): add file_lifecycle and blob_lifecycle

- complete src/application/ports/blob_lifecycle.rs with traits:
    * BlobCreationHook
    * BlobDeletionHook

 - add src/application/ports/file_lifecycle.rs with traits:
    * FileCreatedHook
    * FileDeletedHook
    * FileUpdatedHook

src/interfaces/nextcloud/uploads_handler.rs

@@ -164,11 +164,6 @@ async fn handle_assemble(
             .await
             .map_err(|e| AppError::internal_error(format!("Failed to update file: {}", e)))?;
 
-        state
-            .core
-            .refresh_thumbnails_after_update(dto.id.clone(), dto.etag.clone(), &content_type)
-            .await;
-
         Some(dto.etag)
     } else {
         // For new files we still need to read the temp file since create_file takes &[u8].

src/interfaces/nextcloud/webdav_handler.rs

@@ -566,16 +566,6 @@ async fn handle_put(
             }
         }
 
-        // Bug 1 & 2 fix: invalidate stale thumbnail and regenerate from new blob.
-        state
-            .core
-            .refresh_thumbnails_after_update(
-                updated.id.clone(),
-                updated.etag.clone(),
-                &content_type,
-            )
-            .await;
-
         return Ok(Response::builder()
             .status(StatusCode::NO_CONTENT)
             .header(header::ETAG, format!("\"{}\"", updated.etag))