Add Deck workflow automation Nextcloud app

Ports the standalone due-date cron script into a proper Nextcloud 34
app with a personal-settings UI, per-user workflow configuration
(source/target stack, assigned-user and label filters, email
notification), a TimedJob background runner, and Gitea CI pipelines.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -0,0 +1,31 @@
+{
+	"name": "workflow_deck_automation",
+	"version": "1.0.0",
+	"private": true,
+	"description": "Automates moving overdue Deck cards between stacks, configurable per user.",
+	"scripts": {
+		"build": "vite build",
+		"dev": "vite --mode development build",
+		"watch": "vite --mode development build --watch"
+	},
+	"license": "AGPL-3.0-or-later",
+	"dependencies": {
+		"@nextcloud/axios": "^2.5.0",
+		"@nextcloud/l10n": "^3.1.0",
+		"@nextcloud/router": "^3.0.1",
+		"@nextcloud/vue": "^9.0.0",
+		"vue": "^3.5.0"
+	},
+	"devDependencies": {
+		"@nextcloud/browserslist-config": "^3.0.1",
+		"@nextcloud/vite-config": "^2.2.0",
+		"vite": "^6.0.0"
+	},
+	"engines": {
+		"node": "^24.0.0",
+		"npm": "^11.0.0"
+	},
+	"browserslist": [
+		"extends @nextcloud/browserslist-config"
+	]
+}