feat: Add Docker image update system (TrueNAS Scale inspired)

- Implement UpdateService for image version checking and atomic updates
- Add DockerComposeManager for centralized docker-compose management
- Create 12 docker-compose references in /home/innotex/Docker
- Add 13 new API endpoints (6 for images, 7 for compose management)
- Add comprehensive documentation and examples

backend/config/shortcuts.json

@@ -0,0 +1,15 @@
+{
+  "version": "1.0",
+  "shortcuts": [
+    {
+      "id": "shortcut_1768585316580",
+      "name": "OpenWebUI",
+      "url": "http://localhost:3000",
+      "icon": "🔗",
+      "description": "",
+      "category": "GPT",
+      "color": "#3B82F6",
+      "order": 0
+    }
+  ]
+}