Detect trashed and archived Deck entities, skip archived boards

Deck's Entity getters are magic (__call), so method_exists() never saw
getDeletedAt() or getArchived(): trashed cards were moved, trashed boards
were neither dropped from "my boards" nor detected by findStackIds(), and
every board counted as not archived. DeckIntegrationService now checks the
properties with property_exists() via isTrashed()/isArchived().

Workflows on archived boards stay enabled but are skipped by the runner
(isBoardArchived(), read through BoardMapper) until the board is
unarchived, and the settings list marks them. Archived boards are no
longer offered in the board dropdown at all; editing a workflow on one
clears board and stacks and says why.

lib/Service/WorkflowRunner.php

@@ -229,6 +229,25 @@ class WorkflowRunner {
 			return;
 		}
 
+		// An archived board is intact, just shelved: the workflow is skipped,
+		// not disabled, and resumes once the board is unarchived.
+		try {
+			$archived = $this->deckService->isBoardArchived($workflow->getBoardId());
+		} catch (DeckUnavailableException $e) {
+			$this->logger->warning('Could not check whether the board of workflow {id} is archived: ' . $e->getMessage(), [
+				'app' => 'workflow_deck_automation',
+				'id' => $workflow->getId(),
+			]);
+			return;
+		}
+		if ($archived) {
+			$this->logger->debug('Skipping workflow {id}: its board is archived', [
+				'app' => 'workflow_deck_automation',
+				'id' => $workflow->getId(),
+			]);
+			return;
+		}
+
 		try {
 			$cards = $this->deckService->getActiveCardsInStack($workflow->getSourceStackId());
 		} catch (DeckUnavailableException $e) {