Notify board members about moved cards according to their Deck setting

Replaces the yes/no notify_email flag with notify_mode:
- off:   no mail
- owner: only the board owner, as before (migrated from notify_email=1)
- board: everyone with access to the board, filtered by their own Deck
         "Notifications" setting for it (board:<id>:notify-due: off /
         assigned / all), mirroring Deck's NotificationHelper rules

Recipients are resolved via PermissionService::findUsers() (owner, ACL,
groups and circles expanded), AssignmentMapper::isUserAssigned() and
IConfig, none of which reads Deck's frozen $userId. If they cannot be
resolved, no mail is sent rather than one to the wrong people.

Moved cards are collected over the whole run and each recipient gets a
single digest mail afterwards, in their own language.

Bumps to 35.2.0 so the migrations run.

lib/Migration/Version1003Date20261001120100.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\WorkflowDeckAutomation\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+/**
+ * Drops `notify_email` now that Version1002Date20261001120000 has copied it
+ * into `notify_mode`. It has to go rather than be ignored: Entity::fromRow()
+ * calls a setter per selected column, and Workflow no longer has one.
+ */
+class Version1003Date20261001120100 extends SimpleMigrationStep {
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		if (!$schema->hasTable('wfda_workflows')) {
+			return null;
+		}
+
+		$table = $schema->getTable('wfda_workflows');
+		if (!$table->hasColumn('notify_email')) {
+			return null;
+		}
+
+		$table->dropColumn('notify_email');
+		return $schema;
+	}
+}